It's a good thing he's used to being mercilessly and unjustly bullied by his attractive asshole boyfriend, or else he'd jump a lot more at the sudden plunge of that digit into him. Which is a strange and not particularly great sensation.

Not that he knows from experience or anything.

At worst, his hips give a sharp jolt to match his fingers scraping against the floor. Restraint is for other people, and he's not afraid to give a low moan of pleasured surprise. Immediately afterwards, he remembers to raise his head up, and there's a low lazy grin on his face.

"Poor me."