[Sena Youtaro] Ofuro to Imouto to (COMIC Penguin Club 2022-01)

A brother returns home exhausted, only to have his little sister slip into the bath behind him with a mischievous grin and a bold proposition. What starts as a teasing, soapy exchange quickly escalates into an intense encounter on the bathroom floor, fueled by her desperate craving and his reluctant surrender. The afterglow in bed is shattered when a third party calls on the phone, transforming the lovers' secret into a chaotic, jealousy-fueled nighttime tryst.