My parents have some exercise equipment in the basement, and some days when they are at work I use it in the morning. I also love to masturbate when I wake up, so one day I decided to do both at once.
I stripped naked and walked downstairs (something I almost never do because of the windows), got on the treadmill and started jogging. It felt a little weird at first, but I really started getting horny after a few minutes. When I was done, I was covered in sweat and my pussy was almost throbbing.
Then I got onto the bike, slid my toes into the straps and started pedalling. My pussy lips started sliding against each other, making me moan and cringe. I leaned forward as far as I could so my soaked vagina would rub against the seat and pedalled as hard as I could. I could feel my orgasm coming, so I didn't stop and after a couple of minutes I came harder than I ever had before. I came so hard, I had to lean against the handlebars for a while before I could get up.
When I got off, I leaned down to smell the mixture of sweat and pussy juice I left on the seat. When I went back upstairs I took a hot shower, then got back in bed and masturbated to another fantastic orgasm before getting dressed.