"Thank you so much, sister-in-law." "It's fine, you'll do anything to thank me, right?" Yuya made his wife angry over something trivial and she left the house. Yuya promises his sister-in-law Natsu, who offered to mediate, that she'll do anything to thank her. As soon as he got that promise, Natsu came over to him, generously exposing her voluptuous pure white naked body. Overwhelmed by her pretty smile, Yuya couldn't resist Natsu's seduction, even though he knew it was wrong...