M18 accidentally came to my cousin F25

This is a real story and was absolutely horrified by it at first but now i cant stop thinking about my cousin.

Ive been doing jiu jitsu for about 7 years and I am currently a purple belt. My cousin who is a F25 constantly teases me about it and says im too old to be doing “karate”.

So last week I had enough and said if she could get out of my mount after 5 mins id give her $100. She agreed and said it would be easy. Mind you im 5’10 200 lbs athletic build and she probably 110 lbs max.

So i get on top of her and start the timer. Mind you i have never ever gotten an erection doing jiu jitsu but i mostly roll with men. So we begin and she starts to try to get out of my mount and she has no idea what shes doing. She was literally just air humping and trying to push me off her.

Idk what happened but the warmth of her body and her pretty much humping my crotch started giving me an erection which i was horrified by. I literally had to give her some space so she wouldnt be pressing against my crotch anymore.

Then it happened… in mount i pretty much sat up so i wasnt pressed against her anymore and then she grabbed my inner thigh to try to flip me. When she did that she accidentally brushed her hand against my semi erect dick and my balls and i got fully hard like pulsing hard.

I tried to hide it by bending a bit so she wouldnt see and i didnt want to get off of her because i didnt want her to win the $100. Then out of nowhere she blurted out “holy shit did u get hard”

My face felt like it turned bright red and idk what happened but the combination of the rubbing, her hand accidentally touching my dick and the embarrassment of her noticing just made me ejaculate. I tried to hold it in because i knew it was coming and it just made the orgasm more intense.

I blew my load right in my shorts and it was the most intense orgasm i ever had. I let out a moan too like a bitch and then a huge wet spot formed in front of my shorts. I was horrified so i just stood up and walked to the bathroom. My cousins face was red and she didnt say anything.

After i guess she tried breaking the ice because she was like “so i had 30 secs left so you owe me $100”. I just gave her the money and didnt bring up what happened.

Ever since that day ive been chasing the dragon of that intense orgasm. Ive been fantasizing about my cousin and im disgusted with myself.