Himitsu Wa Kiss De Abakareru summary:

Sharing secrets with a guy whom he despised the most - A popular guy with a high pride, Reo, has something he can't tell anyone. That is, he can't get "it" up. Although he tried to get it up by watching po** videos, none of them actually works. Until one day, he went to a drinking party - which was held by his university colleagues - and during King's game, he was forced to French kiss with Saga, whom he despised the most. Reo who got irritates that the guy he hates is kissing him skillfully in front of everyone.... But then, at that moment, his "lower body" reacts to it....?!+