I was at my cousin's house over the summer (I'll call him *Mark*), and we've always been real close. Our parents went out that night so we were alone watching movies and fooling around. I went to get changed into my pajama's and he came in when I was halfway done. He snuck up behind me, grabbed me, and threw me on the bed.
I only had my bra and underwear on so he had no problem undressing me. I was so shocked I barely put up a fight. We started up a convo about masturbation right then and there as he was stripping and I told him I've never done it. Now, I'm 16 and he's 17 so he got a real kick out of that. He told me to sit back and spread my legs and he shoved three fingers in for the most exhilerating experiance.
I started doing it while he stroked himself, but I wanted to touch his cock. He cummed as I did. I licked it up for him and then he said he was going to eat me out. So I lay down and i cummed in his face as soon as his tounge touched my clit. He started coming up, and I thought he was going to suck my tits, but I felt his dick go into my pussy. I had already had sex with my boyfriend, but *Mark* was bigger and better. After we both orgasmed we lay there naked while his fingers roamed my body and I played with his balls. As soon as we heard the car come in we got changed and started watching TV again. But he promised that when he comes to my house the next time our parents went out we would have some more fun... ;-)