(C85) [GOD Ryokutya (Bu-chan)] Otouto no Futon ni Shinobikonde

A sleepy brother is ambushed by his sister, who decides to exploit his unconscious state, slipping a condom onto his cock before taking him into her mouth and swallowing his cum, all while he remains oblivious. When he finally wakes, his fury erupts as he accuses her of stealing his seed, threatening violence, and she retorts that he violated her first, heightening the dangerous, taboo tension. The scene is charged with incestuous, non-consensual desire, making the doujinshi a provocative, smutty story.