The Little Brother I Received Was a Femboy with Weak Nipples

Shoutarou visits his friend Tomoki's house and accidentally walks into what he thinks is Tomoki's little sister's room, seeing her naked. However, it turns out to be Tomoki's little brother, Riku, who crossdresses. Riku takes a liking to Shoutarou and invites him to his room. Shoutarou, unable to resist Riku's feminine charm and sensitive nipples, ends up playing with them. This escalates into Shoutarou receiving a blowjob and eventually having anal sex with Riku. Shoutarou and Riku continue their intense sexual encounter in Riku's room, trying to keep quiet while Tomoki and their mother are nearby. After finishing, they lie in bed together. A few days later, Shoutarou visits again, and Riku eagerly greets him, having already prepared himself. They sneak into the bathroom for another passionate session, with Shoutarou declaring Riku his 'girlfriend'. " while continuing to have sex with him.