[Mamezou] A Little Sister's Warmth (Nukunuku Mini Holes) [Team Rabu2] [Decensored]

When little Tsumugi catches a fever, her big brother takes Mom's advice to "ask your brother for help" a little too literally, administering her "medicine" deep into her tight little butthole with his finger. Two days later he's still haunted by the warmth that gripped his index finger, and when his innocent sister bounces into his room to sweetly thank him, he decides her next treatment calls for something thicker. A sloppy rimjob "check-up" melts into her first anal ride, sealed with a deep kiss as the siblings' secret prescription keeps getting warmer.