From Fujoshi Bitches:

Your heat won’t leave my body.
Miyama, who always kept having one-night stands and won’t have a serious relationship with nobody, is having an unrequited love for his colleague, Imoto.
Even though he has already made up his mind that he won’t sleep with Imoto because he loves him, for some reason, he ended up sleeping with him.
Although he wants to pretend that all of that never happens and return to their normal relationship like before, Miyama can’t forget that night’s heat no matter what…