[Sakamata Nerimono] It's All The Gal Nee-chans' Fault (COMIC Shigekiteki SQUIRT!! Vol. 19)

Plucky young Kenya-kun is about to get a summer he'll never forget, because his older sister Mai and her bold, big-breasted friends have decided that "video games are for girls," and only something much more physical will do. Cornered in his room, teased, groped, and worked over with their soft curves and teasing commands, the overwhelmed little brother finds his objections melting away as the busty gyaru crew takes turns pushing his small, trembling body past every limit he thought he had. It's playful, dominant, and shamelessly messy from start to finish, leaving Kenya sore, sticky, and utterly outnumbered.