You Live With...

Yuzuriha's mother leaves him in the care of Yuri and her husband. Yuri, having no children, enjoys the feeling of smothering Yuzu as if he were her own and in her doing so Yuzu slowly starts to desire her and fights urges. One afternoon Yuzu is masturbating to Yuri while in the bath when she walks in thinking he is calling out to her and the relationship develops from there.