It's fine that my little sister is wearing a zip-up hoodie without a bra, but the zipper is open too wide and it makes me overly conscious of her chest… Plus, when she leans forward unguarded, her nipples peek out, making me stare and get fully erect! I can't take it anymore, so I lower the zipper while my sister is sleeping. As expected, she notices and gets mad at me, but it turns out she had noticed my erection and was secretly aroused. She says, 'Does this bother you?' and lowers the zipper herself… Is this provocation? Before I know it, my hand is on her chest.
