He felt her starting to kiss back, he felt her pressing her breasts into the palms of his hands. He felt her hardened nipples poking into his hands and rubs his thumbs over them, even as he grins himself against her. His raging hardon strained against his swim shorts as he grinds against her naked sex. He was acting on pure animal instinct now, hot and horny with a naked girl trapped between him and a wall.<br/><br/>Nevermind that it was his sister. He wanted to show her that he could take care of her, that he wouldn't hurt her like other guys. He was always going to be around for her too and had decided he was physically attracted to her in a strong way.