Oyasumi Sex  

잘자요 섹스, おやすみせっくす

Sibling relationships are incredibly strong, but recent events have caused a shift in Akira and Yui's dynamic. Their parents' divorce forced Akira to prioritize Yui's well-being and take on a more paternal role in their family. As they grew older, Akira began noticing physical changes in Yui that made him realize she was no longer the innocent child he once knew. Despite his growing frustration with their distance, Akira couldn't resist sneaking into her room at night to admire her body and pleasure himself. However, when Yui confessed that someone from school had confessed their feelings for her, Akira became even more frustrated and acted out his desires by having intercourse with her while she was asleep. However, it turns out that Yui was aware of his actions and remained silent despite being awake during those nights.