[Piro Mayu] Sweet Crossover (Comic G-Es Vol. 5) [Project Valvrein]

Childhood friends Akira and Kosuke reunite after four years apart, and Kosuke can hardly believe the boyish pal from elementary school has blossomed into a voluptuous girl with a radiant smile and an even more radiant chest. When a shared lunch in her room tips into touch — "if you don't say something, I'll just keep going" — Akira locks her legs around him for a breathless first time, gasping that it's hitting deep inside while he marvels that he's actually having sex with his best friend. She climbs on top to demand more, and by the bonus page she's coaxing every last drop out of him, a sweet crossover from old friendship to something far hungrier.