Usagi-kun wa Ikenai Koto Shitai!

Byaku Uzaki and Tadanao Takaba are childhood friends. Although they were close when they were young, they now behave like cats and dogs, constantly fighting whenever they see each other. One day, Byaku gets his hands on something that gives him leverage over Tadanao. He tries to use it to gain the upper hand, But before he knows it, he's pinned down with his pants pulled off and getting his butt touched! What's more, it feels so good that he can't help but let out a weird noise!? This is a story of an earnest and naughty first love between a seemingly serious, but scheming high school boy and a scampish high school boy who's naive about sex.

(Source: Kasakura Shuppansha, translated)