AAAAALRIGHT LET'S GO
First let me shamelessly promote myself by saying that you can get a taste for OP/UM right now because I wrote an OP/UM smut fic on ao3 called Two Trucks !! (Two trucks, having sex..)
Second.. YES. He has a pretty, soft, fat valve (i hc it as being *red* with a blue node as bright as his biolights) that is soo nice to sink into, bringing him to overload after overload as his partner watches him in awe.
Predaking has a big spike ? I 100% agree. But let me raise the idea that, not only is it big, but.. he has two of them. Predacon biology and all that.
It's their first time, he has to be really careful to make sure Magnus is ready for him.. then he pushes inspiré slowly, so slowly, and Magnus mewls from the stretch. It feels so, so good, and he's overloading before he even knows it - then again a little while later, and again... until Predaking has pushed all the way in.
He's on his hands and knees with Predaking behind and above him, trembling from how impossibly full he feels - mewling again when Predaking's large hand gently rubs and presses onto the bulge created on his stomach.
Then Predaking finally starts moving, and Magnus can barely hold himself up, trembling and moaning so loudly as he's fucked harder and harder..
He overloads so many more times before Predaking finally does as well, and again as he feels the hot fluids spilling deep inside him - stuffing him even more, and making the bulge grow, as they're kept inside him by the large spikes plugging him up.
Repeat a few times as Predaking pumps him full once or twice more, and Magnus is a *mess*, Predaking making him close his panels so nothing leaks out. Way too proud of himself as he sees the bulge is still there - Magnus too full of transfluid, even once he's pulled his spikes out..
(Okay first: you sending me a cute little "👉👈 TFP Magnus 🥺" and then jumping straight into horny in the second ask is so funny I love the energy
Second: guys please please please read this please please please
Now onto horny)
Just let me at his valve just one please come ON man just let me at it just one time PLEASE come on-
Wahhhhhhh red with bright blue lights... And a big node.... 🥺 I bet it's sooo sensitive, it's sooo easy to make him overload... he's shy about it. The perfect valve....
God, Predaking seeing how soft and welcoming Ultra Magnus' valve is and decided hes going to take both of Predakings spikes.... So good..... Fucking Ultra Magnus must make even the strongest mecha feel cocky, he's so sensitive, he always ends up overstimulating himself into a mess even when he's trying not too.
Ugh Predaking filling Ultra Magnus up with so much transfluid that it leaves a tummy bump afterwards 🥴🥴🥵 making him close his panels even though he's still so wet and sensitive, poor Ultra Magnus...
...
Predaking making Magnus walk around filled with transfluid, bending him over his desk to fill him up again whenever Predaking feels like it 👉👈🫣🫣🫣










