I have a bunch of porn videos saved on my computer. I have something about me that makes me masturbate every night. It just happens. Even if I have sex with my wife at night, I end up masturbating. It's just the way it is. I can't explain it. I'll get on my computer, pull up some of my videos, or at times, use a couple of sites that I like using, get some paper towel, jerk off for anywhere from 5 minutes to 15 minutes, squirt in the paper towels, and go to bed. I've done this for years.

Last weekend, my daughter had someone spend the night. Her friend Tara had probably been over a hundred times. I knew Tara had boyfriends, had fucked around, and all that. My daughter usually tells me everything. No big deal. Well, they head up to bed about 1am, and I waited as I usually do. I look up the stairs. I walk up part way. Make sure no noise, they are sleeping, whatever, and I get my paper towels, tune my porn in, and jerk off. Usually squirt and I'm done. Not this time. I'm half way through it, dick is throbbing, I'm using the paper towel to stroke, ready within a couple of minutes to blow, and Tara walks downstairs into the living room. It was obvious what I was doing, as quick as I yanked my penis back into my shorts. She looks and says "whoops. Uh yeah, sorry dude. I didn't mean to interrupt you. Awkward". I just laughed. What are you going to do? And she says "don't let me interrupt. If you wanna finish". I was hard. I couldn't stop myself. I just said "well thanks for permission" and she just laughed again. I didn't want to wait until she was upstairs, but I also had never jerked off in front of someone. She sat on the couch and said to me "don't let me stop you" so I just shrugged, turned it back on, and started watching. It took about 5 minutes of making out and whatnot until they get out of their clothes, he's hard, and wrapping his cock with a condom. She's watching with me, and I look over, and she's got her hand inside her shorts. I just looked and she didn't say anything. I'd never seen a girl her age masturbate, but fuck it was amazing. A huge turn on.

I pulled my shorts down, and I had them to my knees. I stepped out of them, got the paper towel I was going to use to jerk into, and started stroking. While I was, she kept moving her hand, and I guess I was just horny, but said "can I see?" She kind of looked at me, and didn't say anything. But she pulled her shorts and underwear off. I sat there staring at a brown patch of pubic hair, while she was rubbing her fingers in it, and sliding them inside herself. I was so turned on. I was watching her as much as the video. And then she came. Hard. She started making noise and kept going. And when she finally stopped, I just said "wow". She just breathed really heavy, and said yeah.

I was watching more, and they got to the point where he was going to unwrap the condom and put it on his cock. I felt myself getting harder, because when he gets inside her, usually, just as he cums in the condom, that's when I make myself cum. As I'm watching, growing harder, and more turned on, I watch Tara start to touch herself again. I get even more turned on. And she leans back. I look at her, and she looks at me.

I stood up, dropped the paper towel as she was leaning back and I entered her. She gasped, and looked at me. I just said "shh" and I pushed inside her. She didn't try to fight me, or push back. So I started thrusting inside her. Slowly at first, and then faster later on. She was gasping and breathing, and I felt myself a couple of minutes later ready to explode. I hear her say "oh god" and I felt her gasp. I knew she was cumming. I kept pushing, and trying to hold back. I didn't know what to do. And I finally said to her I gotta stop. She said "no please don't stop". And I came. Hard. Really hard. I just felt it explode. It made me lose my breath. It kept going and going. And when I stopped, I was limp, soft inside her, and soaked. And I heard her say "holy jesus"

I just stood there against her. I wasn't sure what to do. I backed up, saw my limp penis, and she sat up. She took her shorts, wiped up a bit, and pulled them on with her underwear. She went into the other room, and like two minutes later, I heard the water going, and then a couple minuets later, I heard her go upstairs. Without even another word. I wasn't sure what the hell to think.

I got dressed up, wiped up, cleaned up in the bathroom, and ended up going into my bedroom about 20 minutes later. The next morning, she was with my daughter, so I couldn't say anything about it. And it's weird as hell. She literally never said another word to me about us doing what we did.