My face relaxed a little, he was right but still, an almighty groan filled the air and we quickly peered again towards the excitement, her mouth open ...nd a long moan escaping from her pretty lips. He was moving ever more inside her slowly but surely as her ass glistened around his huge cock.Once inside he held her cheeks tight and slowly caressed his way towards her chest, large hands around soft and pert tits. She looked back and smiled as he kissed her and slid in and out of her tight. I was so wet everywhere that they slid freely. For an instant I was disappointed. Then she started again and I felt the orgasm building slowly once more. This time my breathing was more out of control, the rising and falling off my chest flowing with a quiet desperation to climax. Her finger circling motion seemed to lift me above the level of orgasm and my hips moved with her. She was holding me there without coming.All of a sudden, she backed away again, her fingers slipping down my lips,. Every time you help me add a pair to my collection I’ll let you fuck me.”I was jumping for joy inside but I told her that it was a deal. Then I went to my bedroom to jerk off.After dinner Mom asked me to go over to Tim’s house and come home with a pair of his mother and his sister’s panties.I gave Tim a call and told him that I would bring over a game that he has wanted to borrow. When I arrived I noticed that his sister smiled sweetly at me. So when Tim got interested in the game I went to. I kissed her mouth and her hand descended to hold my cock. I sucked her nipples, which were firm and chewy, and she sighed with pleasure.I moved down to her navel and poked my tongue into it, then kissed her all the way down until I was between her thighs, which were only slightly ajar. I pushed them apart and she co-operated. She wasn’t going to make any of the running as regards opening herself up to me, but she was waving me through when I asked the questions.I pulled her labia apart and.