My Stepsister is a Total Slut!?

Synopsis

“I’m telling you upfront, I don’t do this with just anyone…” After a workplace romance, marriage, and becoming parents, Kenya faces an unexpected situation. Following a year of sexlessness, his wife declares she dislikes sex and proposes a no-sex marriage. Just as he reluctantly accepts, she shockingly grants him permission to cheat—with her sister-in-law, Yayoi. It turns out Yayoi has a reputation for casual encounters and becomes oddly curious about Kenya when drinking. Though he never viewed her that way, once they’re alone in a hotel room facing her alluring body, there’s no turning back.