My younger sister who has grown up to be a douchebag is very cute, but I thought she was super serious and had nothing to do with sex, but she turned out to be an extremely lewd girl! At her house, my unsuspecting girlfriend's younger sister found out that I had an erection, and when I thought that she hated me, she started to get excited...so much so that she straddled me and shook her hips violently! His cock drips with lewdness that you can't imagine from his usual seriousness.