Because my father remarried, I, who had never had any luck with women, suddenly got a cute big-breasted little sister who seemed weak and would do anything if asked! At first, I held back, but she was so unguarded that I reached my limit! Taking advantage of her weak personality, I begged her to let me do it, and she said 'Just rubbing is fine,' so we did quasi-sex. But of course, I ended up inserting it!
