The first time had been out of sheer curiosity, I wanted to know what girl's underwear felt like compared to my plain white Y fronts. So when everyone...left the house when I was 15 and a horny teen anyway I made my way to the clothes hamper and grabbed a pair of my sister's underwear and then ran back to my room. My finger clasping her dirty things were trembling but locking my door I stripped down naked. At the time I was just starting to fill out so I still had a bit of a slim girlish build. Soon his sister started to breath funny and her face became flushed. The boyfriend unbuttoned her blouse and felt around her heart to see what was wrong. That must not have helped because he then put both hands under her blouse. Her breathing became even faster after he unhooked her bra and put his face inside her blouse to get a better look. Sis moaned a few times as the boyfriend ran one hand up under her skirt. That was when Sis announced that she was really hot. The boyfriend stopped. That kiss started and led to other things that were going to happen. At first the kisses became more passionate, with tongues being involved. A kiss like that from her always turned me on and would lead to an almost instant erection. It took only moments for my hand to find her ample breast and start to squeeze her already hard nipple through her blouse and bra. That was her queue to place her hand on my shorts and begin playing with my cock. I replied by grabbing her pussy with my free hand. Hearing what Andrew was saying, confused Emma greatly. Why had she promised her mouth to Daniel like that? Was he correct? Was she really just a slut for him for the rest of her life now? He was handsome and she loved being dominated. She knew she wouldn’t figure it out in just one night. Then Daniel spoke again!“Alright Emma! It time to change around. It’s time for me to ass fuck you while you suck on Andrew’s cock! And this time, you will make him cum in your mouth, and I’ll cum in your ass!”.