[Mizuyuki] Onee-chan-tachi to Issho ni Zenpen (COMIC HOTMILK 2023-09) [SDTLs]

Nako-nee-chan has been acting strange lately—flushed, distracted, hiding something—and when her mischievous friend Yuu catches young Hiro-kun staring up their skirts, the two schoolgirls decide the flustered boy has earned a very hands-on education. Playful teasing escalates into a sweat-soaked first threesome where confident Yuu rides him while admitting she's getting addicted to his dick, and shy Nako finally confesses she's been secretly training her butt for him too. Between the uniforms, the condom, and two hungry onee-chans competing over his virginity, Hiro-kun is in for far more than he bargained for.