Sayonara Dattara Yokatta

"Today I'm going to have sex again. With my crush's younger brother."

Keigo, a former aspiring novelist, has long had a crush on his childhood friend, Ryuuji. Unable to forget a joke that Ryuuji made in the past, he even developed a fetish for wearing black tights. The only person who knows both "secrets" is Saku, an art student aspiring to be a cameraman—who is Takashi's younger brother. To help comfort Keigo's bottled-up feelings, Saku calls himself "Ryuuji" and has sex with Keigo as a substitute for him. "I want you to write a novel" being the reason Saku has sex with him, Keigo can't seem to determine what his true intentions are...

(Source: Shodensha, translated)