I’ve been thinking about this ask (https://www.tumblr.com/unsanitarystation/743749088612335616/cw-for-twincest-here-but-heres-the-drabble-friend?source=share) for some time now.
The idea of mech A being unable to use a toilet because they promised mech B that they will only use their mouth to void into is too hot to ignore. So, I thought: ‘What would happen if someone had COMPLETE control, not just a promise, over a mech’s waste tank?’ This ask is mostly about piss kink. All of this is around 3k words long.
All Cybertronians pee from their valves and all their toilets are squat toilets. Sentinel becomes the Primes’ slave by accident and then is saved by Starscream after all of them die.
Before Sentinel from TFone steals Megatronus’ T-cog he’s much smaller, shorter and less bulky than his movie version. Little Sentinel’s body creates addictive pee and the Primes find out about it by accident. At first, they order him to stop using a toilet and only void into a big cube while one of them watches. Sentinel finds these orders bizarre and disgusting. Being watched while peeing is embarrassing and humiliating which is why Sentinel doesn’t want to follow them and uses a toilet when the Primes aren’t watching. The Primes inevitably find out about Sentinel sneaking in to void into a toilet and decide to do something drastic about it. Sentinel doesn’t know yet why the Primes want to collect his waste fluid.
They put a special remotely controlled catheter into Sentinel’s urethra to completely control when he voids and how quickly he can void. The catheter also collects the information when and how much he voids. Sentinel is a smaller mech and his bladder isn’t very big, which is a problem because all 13 of the Primes like to drink his waste fluid and his body doesn’t produce a lot of it. The Primes keep tabs on each other to make sure everyone drinks an equal amount.
It takes some time for a Prime to order Sentinel to show them his valve but instead of telling him to void into a cube they put him on their desk and kneel before his spread legs. They quickly start licking his valve and sucking his external node. It happens so fast Sentinel doesn’t have time to react. He’s clutching their head and moaning without abandon. He quickly overloads and the Primes keeps on pleasuring him. What Sentinel didn’t notice was that the Prime forced him to slowly dribble piss when they were licking his valve. It takes few more times to notice what the Primes are doing because not all of them care to pleasure his valve while drinking from him. Sentinel is disgusted that they are drinking his waste fluid.
Sentinel’s valve is too small to be spiked by any of the Primes, so they sometimes sit him on their pressurized spikes and make him rub his external node over them. Sentinel has a surprisingly big spike for his frame and the Primes make sure to use it. They sometimes order him to lick their valves or spike them. The Primes always make sure that Sentinel licks them clean after he’s done servicing them. Licking his own transfluid from their valves isn’t pleasant because it doesn’t taste very good but Sentinel is used to it. That’s why he prefers to lick their valves and not spike them. He has spent a lot of his time kneeling under their desks, sucking on their external nodes.
The Primes keep his waste tank nearly full all the time after they start drinking his waste fluid from the source and not a cube. It’s horrible to exist with a constant need to void and Sentinel is hardly ever permitted to completely empty his waste tank. Sentinel is too busy thinking about his bladder to betray the Primes in this AU. His small valve gets so wet when he’s bursting it’s embarrassing to open his modestly panels. No matter how many times he begs the Primes to let him pee, they never do.
Sentinel sometimes goes to a bathroom to use a toilet without the Primes’ knowledge and tries to void to no avail. He squats over the toilet and touches his wet valve and the protruding part of the catheter but nothing ever comes out. He’s crying and begging for it to just let go because he’s so uncomfortably full and needs to pee. Sentinel starts to walk a little funny when he’s nearing his limit. The Primes successfully break his mind.
One time, Sentinel starts to starve himself to produce less waste fluid. The Primes quickly find out about his little scheme and punish Sentinel. At first, they try to force-feed him energon which ends with Sentinel spitting most of it out, so they are forced to find a different way before using a feeding tube on him as the last resort. They try to breastfeed him next. The Primes tell Sentinel about the consequences of biting their nipples before forcing Sentinel into taking one of their nozzles into his mouth. He spends literal hours sitting on a Prime’s lap with a nozzle stuck in his mouth before giving up and experimentally suckling on it. The sparkling grade energon tastes so good Sentinel can’t stop himself from drinking it until his fuel tank is full. Being fed breastmilk leaves him a little sleepy and much more compliant which the Primes love. After enough time being fed exclusively breastmilk Sentinel stops being able to drink normal energon. Another thing that shackles him to the Primes.
Sentinel loves the rare days when the Primes let him completely drain his waste tank into a huge cube because all 13 of them want to drink his waste fluid at the same time. He is ordered to kneel over an empty cube as the Primes use the catheter to make him slowly drip piss into it. It takes a full day for his bladder to be completely emptied but the relief that will come at the end of the day is absolutely worth the long wait. Sentinel is never bound when the Primes leave him alone for a full day because they know that he will not leave and miss this rare opportunity to fully empty his bladder. He obediently kneels and waits for the percentage to go down until it reaches 0%. It’s his only entertainment during the long wait.
Sentinel sometimes cannot fall asleep when he’s too full. His squirming oftentimes wakes the Prime he’s forced to sleep with in their berth. He sleeps with a different Prime each night unless he’s being punished. If the Prime gets irritated enough with Sentinel, they sit him on their face and make him pee into their mouth as little as possible to relieve the pressure in his waste tank to make it possible for him to fall asleep. The Primes always act so inconvenienced when they drink from him while they’re trying to fall asleep because they’re wasting their turn on Sentinel’s pee. After letting him pee they order him to touch their external node for being such a burden. Some of the Primes order Sentinel to stick his spike into their valve for the night. He’s not permitted to overload when a Prime is cock warming his spike.
Sentinel’s valve is too small to be penetrated by any of the Primes. Even sticking one finger (belonging to a Prime) into it is a tight fit, Sentinel can put his own two fingers into himself. The Primes still find a way to frag his little valve. They create a thin false spike that they can all connect to at the same time and feel everything done to it. The Primes force him to use it while they all watch. Sentinel tries to ignore their hungry stares as he masturbates with the small dildo on a berth. He closes his optics in order to continue fulfilling their order. The false spike feels so good in his valve because it has nice ridges and also vibrates, he can’t stop himself from moaning. He’s so preoccupied he doesn’t notice the Primes extending their spikes and lightly touching themselves. Sentinel overloads and stops moving the dildo inside his valve. The Primes reprimand him for stopping and tell him to continue spiking himself with it. Sentinel opens his optics and looks at the Primes. They tell him to go back to work because they haven’t overloaded yet and they’re so close. Sentinel is informed about how the false spike works. Knowing that all of them are currently ‘spiking’ his little valve turns him on A LOT. He doesn’t want this to turn him on so badly but it does which makes him feel embarrassed and very desired at the same time. When his second valve overload hits, he squirts valve lubricant to the joy of the watching Primes. They quickly overload from their spikes too.
The Primes sometimes take baths with Sentinel. He draws the bath and in the meantime strips the sitting Prime of their armor and then himself. Many of the Primes like to time their baths when Sentinel is especially full and is constantly squirming in desperation. They like to squeeze his armorless stomach over his bladder and feel his body tense and him moan in pain. His face scrunches up in pain so beautifully and sometimes he even starts crying a little. Sentinel always feels like he’s going to pop when they do that to him. Sometimes, he fantasizes about actually popping and no longer being forced to deal with them and their control over his waste tank. The Primes love groping his armorless protoform while he washes them because it turns them on. Sentinel touches their external nodes multiple times until they overload during these baths. After he’s done washing the Prime and himself, he dries both of them with fluffy towels. Sentinel is permitted at the end to void a little for doing such a great job and being their very obedient servant.
Starscream learns about Sentinel’s existence when he accidentally bumps into him inside the Primes’ tower. He remembers seeing Sentinel by the Primes’ sides but then he just stops showing up and no one notices. Except for Starscream, that is. The seeker tries to talk to him but Sentinel always keeps quiet or a Prime takes him away. Starscream cannot stop thinking about him. Sentinel, on the other hand doesn’t remember the last time he has used a toilet. He’s just uncomfortably full all the time and sometimes horny because of his full waste tank.
One day, all 13 of the Primes die to Quintessons during a battle and Starscream is chosen as the next Matrix bearer. He becomes taller and stronger. The liquid energon keeps on flowing while Cybertronians keep fighting Quintessons. Starscream inherits the Primes’ living quarters (their tower) and all their personal things. He later learns that it also includes their slave, Sentinel. Starscream has a hard time believing that the Primes kept a mech captive but the living proof of their depravity literally stands before him. Some of the servants and guards knew about Sentinel’s existence. Sentinel exhibits behaviors that concern the seekers. Starscream loves being called ‘master’ or ‘lord’ but hearing these words from Sentinel doesn’t fill him with joy as it normally does. Sentinel is quiet and very obedient which probably means that the Primes broke him in well. Starscream and his trinemates also suspect that he’s been sexually abused by them too.
It doesn’t take long for Sentinel to beg Starscream to let him void. Starscream doesn’t understand and Sentinel tells him about the catheter. Starscream and his trinemates are horrified but it doesn’t end here. The seekers can’t remotely control the catheter like the old Primes, so Starscream decides to remove it. They write a code to disable it and unstuck it from Sentinel’s urethra. Thundercracker is holding Sentinel up while Skywarp watches. Starscream kneels before Sentinel, grabs the catheter with forceps and lightly tugs. The catheter doesn’t want to budge so Starscream pulls it out with great force. The catheter slips out and Sentinel screams in pain. It’s quickly followed by him pissing himself while Thundercracker is gently holding him up because he has gone completely limp in his arms. They did it in a room with a floor with a drain for easier clean up. Sentinel starts crying and after he stops voiding the seekers can see blood slowly dripping out of him. Starscream looks at the catheter and sees that it’s covered in barbs. He has accidentally shred Sentinel’s urethra. Thundercracker and Skywarp take Sentinel to bathe him while Starscream is left alone in the room, looking at the torture device.
They take Sentinel to a medic and are informed that it’s going to take a VERY long time for his urethra to heal. Not only that but during this time Sentinel can’t have another catheter inserted which means that he will be continuously leaking all of his waste fluid as he’s too damaged to hold in his pee. The damage is fortunately not permanent and will heal with time. The medic puts special sponge for incontinence between his crotch armor and his opened valve panel to prevent leaks. When they carry him to their room Thundercracker gives Sentinel a towel to sit on because the sponge is not going to last very long but the towel can be washed and reused.
Starscream is very busy being the new Prime and keeps taking Skywarp who can teleport with him. Thundercracker spends the most time with Sentinel. He quickly learns that Sentinel cannot eat normal energon and needs to be breastfed. He goes to a medic to have his filtration units onlined in order to feed Sentinel and not letting him starve. He works with his trine to slowly reintroduce Sentinel to eating normal food. Thundercracker pumps his breastmilk, so Sentinel doesn’t have to go hungry when he needs to leave with his trine. The Command Trine has a hard time understanding why the Primes abused him and kept him as their slave because he’s so innocent and not evil.
Sentinel thought that being forced to have a full bladder all the time was bad but constantly dripping waste fluid is even worse. It’s disgusting and humiliating no matter how many times the seekers tell him it’s OK because his body is currently hurt and is slowly healing. Sentinel makes sure to never mention to his new Prime and his two trinemates why the old Primes put the catheter into him. He doesn’t want them to drink his apparently addictive waste fluid. He feels so ashamed because he’s unable to properly serve them without wetting himself. Sentinel feels like a failure. He keeps bleeding for a week after the catheter is removed and Thundercracker is the one who gently cleans his valve from blood and waste fluid before giving him a fresh towel to sit on. His bleeding urethra surprisingly doesn’t hurt that much, the removal of the catheter hurt like hell though. The seekers don’t give him any sponges so he can’t leave their room without leaking but Sentinel doesn’t think he would even want to leave in the first place.
When Thundercracker and Skywarp were bathing Sentinel shortly after Starscream had removed his catheter, Skywarp accidentally squeezed his armorless stomach when he tried to get him out of the bath and Sentinel nearly started crying again from pain. He was so sore after being forced to hold his pee for so long. They had taken off all his armor before bathing him and cleaned it too. After the visit with the medic, he gets to spend all his time in their room lying in their berth holding a towel to his leaking waste outlet. Starscream gives Sentinel his own heated pillow so he can hold it against his sore stomach, after he transforms his stomach armor away, to ease the pain. Sentinel spends most of his days lying curled up on his side in their berth, wallowing in self-pity.
There is one incident when Sentinel leaves the room with a sponge stuck behind his panels accompanied by Skywarp. They go to see something cool and when they go back to the room Skywarp sits on the berth while Sentinel kneels before Skywarp’s spread legs and licks his crotch armor. Sentinel wants to thank the seeker for spending time with him in a way he knows the old Primes enjoyed. Skywarp stops thinking as Sentinel manually opens his panels and licks his uncovered valve. Skywarp flinches and teleports to get away from Sentinel. Skywarp falls on the floor with a clang while Sentinel is left kneeling on the other side of the berth confused. Skywarp tells him he shouldn’t frag with people without telling them beforehand what he wants to do with them. He’s shaken and tells his trine about it, so they can talk to Sentinel about his behavior.
The other incident happens when Sentinel springs an erection while having his armor and protoform groomed by the three seekers. He’s embarrassed but the seekers tell him he can go to a bathroom, masturbate and then come back, so they can continue grooming him. All of them wordlessly decide to never talk about it. Sentinel sometimes fantasizes about Starscream abusing him but quickly stops this train of thought because he’s not like the old Primes. He misses the horrible treatment even though he knows what the old Primes did to him was wrong.
Sentinel keeps having accidents even after his urethra has completely healed. He spent so much time with a catheter and then after it was removed he has been constantly leaking waste fluid, he forgot how to hold in his pee. The Command Trines teaches Sentinel how to relearn control over his waste outlet. He pees himself whenever he laughs or sneezes and sometimes even when he moves in the wrong way. He keeps using sponges to prevent leaks and cannot stop thinking about how grateful he is to have a working waste outlet and control over his own waste tank.
titsay
turnnoffyourmind
origamiaround
yousharknotpass
kaledo-art
germansingergirl
