I have a nice sized extended family. On both sides of my family, there's a bunch of cousins, many around my age. There's also a few that are younger than me. Over the summer after I turned 19, one of my relatives asked me to babysit their 12 year old son. They also had a daughter who was 18, but she was already busy the evening they wanted to go out, so they asked me.
It was an entirely uneventful evening. We had some simple mac n' cheese, watched some movie and played with his toys. Around 8pm, I tucked him in to bed and went downstairs to watch ESPN. Shortly after 9, the daughter, Maggie, came home. She and I talked for a little bit, but she was tired and wanted to go to bed. She then asked where I planned on sleeping for the evening, and I told her the couch in the living room. That's when she volunteered her bed.
Maggie was quite hot for being just 18. She was a little curvy, but had large breasts. I never knew what size they were, but whenever we'd go swimming together, I could see they were big. She would always wear small bikinis, and now I may finally get to see the twins in the open.
We both went to bed around 10, and things got interesting from the start. I had my little backpack of overnight stuff, including a pair of pajama bottoms and I told her I was gonna go into the bathroom to change when she stopped me. She did so by taking her tight T-shirt off revealing her well-endowed chest strapped in to a lace-trimmed bra. I was already speechless and dropped my bag of stuff on the floor while she reached behind her and undid her bra and let that fall to the floor next to my bag. "Your turn." she said.
I quickly took my shirt off, but that didn't please her. "That's all? I thought you were about to go change in the bathroom. Well, change here instead." Following those instructions, I dropped my pants and threw those to the side. That was more to her liking, but she then took control. After planting a solid kiss on my lips, she reached down, took off my boxers, and then dropped to her knees. My dick was getting excited just from seeing my cousin's bare tits, and the kiss helped make me hard. She wasted no time in taking my cock in her mouth and blowing me.