I'm a bigger guy, not a lot of fat but a ton of muscle, I had just turned 15 when this happened with my ex who was a little over a year older than me, she was very small, she weighed 107-108 compared to my almost 280.
My ex-girlfriend and I decided to post our fun story, so enjoy. My parents had just dropped us off at the movies and Alice in Wonderland was playing, my ex is a big fan of the author so I decided she'd owe me. So we buy our tickets, get our popcorn and drinks, and then go to our seats.
My ex and I are getting turned on as is the norm for us since we are sexually active. So I begin rubbing her through her jeans, they were so tight I couldn't find her slit without difficulty, as she doesn't wear panties often. As soon as the lights dim she has my pants unbuttoned and unzipped, she kisses the length of my cock whilst sliding her tongue around it, she then takes hold of it and starts pumping slowly, with an determined look on her face.
She stuck the head of my cock in her mouth and looked up at me innocently. I began running my hand through her hair and running my other hand down her back to her ass. I slide my hand under her jeans and begin to finger her ass slowly, with her moaning and still looking at me, her mouth suddenly being filled with my hot, thick cum. She gets every last drop out of my throbbing cock, and smiles.
She continues to massage my balls and pulls my head down to her so we can kiss, as she knows I enjoy the taste of my own cum. She brings it to the edge of her mouth as always so we can both enjoy the thick, white substance. I take my share and we make out with it still in our mouths.
By this time I was fully hard again, so she took my cock and massaged it with one hand while playing with her tight, wet pussy with the other, and humping her ass against my fingers, she continued moaning and enjoying herself, and I looked over to see quite a few people enjoying the show, this turned both of us on even further and soon brought my second cum and her earth shattering orgasm.
After that we sat there exposed for a while.
I hope you've enjoyed my story.