[Crimson] Ane no Kareshi ni Moteasobareta Watashi Gakuen Hen (Gazou Size Dai)

A schoolgirl's biggest secret wears her sister's boyfriend's smile—between classes he corners her for kisses against the school walls, and elsewhere gloved hands knead her enormous, sweat-slicked breasts while she bites back the sounds he pulls from her. Every session balances on the knife's edge of discovery, whether it's a shout from across the yard or the baseball club strolling past the warehouse where she's being fondled, flushed and trembling. Part two of her school chapter pushes the forbidden arrangement further, the curvy heroine caught between guilt over her sister and a body learning to crave being toyed with by more hands than one.