Please Tell Me "Good-Bye".

A former aspiring novelist Keigo has long had a crush on his childhood friend Ryuji. He has even developed a fetish for wearing black tights and indulging in sexual acts because he cannot forget a joke Ryuji once told him. The only one who knows about these two "secrets" is Ryuji's younger brother, Saku, an art student aspiring to become a photographer. Saku makes Keigo calls him "Ryuji" and have sex with him as a substitute for Ryuji as if to comfort Keigo's feelings that have nowhere else to go. Keigo has no idea why he has sex with Saku, nor does he know the true meaning of Saku's wish that he write novels again......

(Source: Shodensha, translated)

Note: Includes one extra chapter.