[Futamaro] Hatsujou Bishoujo no Midara na Mitsutsubo Ch. 1 [Kuraudo]

When a sister tracks down her unsuspecting brother in the men's bath, a shared history of blackmail and a missed erection slip resurface, sparking her bold offer to "help" him relieve his frustrations in secret. Their playful banter quickly shifts toward something more heated as she confesses her racing heartbeat and he struggles against the taboo of becoming her lover. The steamy public setting only heightens the risk and the thrill as their sibling tension gives way to undeniable desire.