[Misaki Tokinobu] My Girlfriend's Little Sister is a Carnivorous Gyaru Ch. 2 (COMIC Mugen Tensei 2023-12) [biribiri]

Tarou-kun's diligent study sessions take a wildly carnal turn when his girlfriend's older, sensationally curvy gyaru sister, Sara, intervenes with teasing offers of "extra study," turning an innocent tutoring arrangement into a breathless, hidden affair. As Sara's sisterly jealousy and voluptuous, bound figure ignite tangled encounters, the secret tryst spirals into an FFM rendezvous that leaves the studious boyfriend thoroughly corrupted and unable to resist.