I went home at night and tucked into bed with my girlfriend. The next morning, my normally quiet girlfriend was suddenly very enthusiastic, French kissing me and giving me a blowjob. Her extremely erotic actions had me fully erect in no time. However... it wasn't her who was there, but her older sister, Mayu! "Your boyfriend's penis is so big," she said, and inserted it in me in the cowgirl position... Mayu, the complete opposite of my girlfriend, was a carnivorous bitch who seduced me...