Karami Zakari if Boys Love: Yarichin Yakyuu-bu no Tomodachi ni Hamerareta Ore

Takanari watched his best friend Takashi cuckold him with a girl from his class named Iida, who he secretly had romantic feelings for. Dragging these rather bitter memories around with him, he continued to stay friends with Takashi, but one day he finds himself left alone in a room together with Takashi who had asked him for help with studying. And so, from Takashi's mouth came this shocking proposal: "Hey, you wanna try anal sex?" This unrivaled dick who took my crush's virginity wants to fuck me next?