Thinking of tentacle monster that fucks you from the inside out. It forces its way inside your body, living in your stomach or womb. And from there it will occasionally use its tentacles to rail your holes whenever it pleases without warning
From in your stomach, you could just be buying groceries when suddenly a tentacle jams up your throat into your mouth. You gag and choke on it as it fucks your throat, and if you don’t want people to pass by and see a tentacle thrusting in and out of your mouth, you better keep your jaw clenched shut so it can’t make it past your teeth. You can try and struggle to swallow it back down into your stomach, it but fights you every step of the way, and the feeling of your throat constricting around it only helps please it. Alternatively you can give it lighter swallows and suck on the tip in your mouth to make it cum faster and therefore stop sooner. And if you’re not exceptionally skilled at swallowing up its seed faster than it can pump its load, you’d better find somewhere for it to go. From an outside perspective it’ll probably look like you’re vomiting up cum. But once it’s over, it’ll slowly recede back into your stomach
From in your womb, you could be sitting on the bus waiting for your next stop when you feel it start to press hard against your cervix, and you only have a second to brace yourself before it shoves itself into your pussy and starts thrusting in and out. There’s not much you can do without drawing attention to yourself, so you have to just sit back and try not to moan out loud. Sometimes it’ll stick further out to stroke different segments of its long tentacles, snaking around you. Someone might notice the moving shapes under your clothes if it extends far enough. Eventually you hobble off the bus and find a private place to slip your clothes off, and jerk off the tentacle to help it finish. Then you lean against the wall, whining a little it pulls all the way back into your womb, rubbing your insides all the way.
Idk something about the helplessness of the monster fucking you being the safety of the one place you can’t even try to do anything to it: Inside you. And if anyone knows where to find content similar to this please lmk. Doesn’t even have to be a tentacle monster, just anything fucking someone from the inside
