We have a couple down the street with a six year-old daughter that I babysit for quite often. This past time, they had a wedding to attend out of state and had to be gone overnight, so they asked if I would watch her and I agreed. Instead of her staying with us, they offered to have me sleep over at their house which was fine with me.
Since I watch her so often, she almost thinks of me as a big sister. When I got there, we played some games, I painted her nails, got us a pizza for dinner and watched a movie. When it started to get late, I put her down for the night and went to take a shower. When I got out, I was just wearing my towel and was going to get dressed for bed. I turned on the TV and started going through the channels, when I saw that one of their movie channels was showing a bunch of porn movies all night long. I turned it on just out of curiosity, but wasn't planning on watching them.
That changed. Before I knew it, the towel was on the floor and I was spread out on their bed masturbating. I didn't stop after the first time, so I just kept cumming and cumming. I lost track of how many times I came, but when I looked at the clock it was almost 3am, so I turned off the TV, pulled up the sheets and tried to fall asleep.
The next morning, I was lucky the sheets were still pulled over me, because she jumped onto the bed with me, waking me up. She wanted me to follow her downstairs, so I told her I would be down in a minute. After she left, I threw on my sweatpants and a t-shirt, went down and made us some breakfast. The whole time, the seam of my pants was moving against my clit, driving me nuts. It's a good thing they were black, because by this time I was wet again. When we finished, she wanted to play outside, so we grabbed our sandals and went out to their swingset. At first I was just pushing her, but she wanted me to swing too, so I got on the other one. Sitting in that swing, the pressure on my clit was so strong, I nearly came again then and there.
We stayed outside for a little while, then went back inside and watched another movie. It wasn't long after that her parents came back home, so I grabbed my stuff and said goodbye to her then went home. As soon as I got home, I went to my room, peeled off my wet pants and masturbated again.
The next day, they came over to pay me and thank me again, but little did they know they basically paid me to masturbate.