[Oroshi Ponzu] A Story About Being Locked In a Room Where You Can't Leave Unless I Do Perverted Stuff With My Apathetic, Boyfriend-Having Student {Doujins.com}

Trapped in a room with no way out, a teacher is informed by his apathetic, boyfriend-having student that hunting for an exit is 'inefficient'—far simpler to just do the perverted stuff and be done with it. She unzips him with vacant calm and services him without so much as a blink, then climbs aboard for a mechanical, dead-eyed ride, flatly murmuring 'please, cum' while he spirals over having sex with his own student. With discovery looming, the encounter closes on a hasty scramble for a condom, since it would be 'really bad if we get found out.'