She and I were seriously dating, soon to be engaged. I was 19, she was 17.
We were at a house party – it wasn’t a “swinging” situation or anything like that, just a good party with a few people making out, lots of drinking and laughing, fun party. I was aware that my girl’s former boyfriend would be there, but since she and I were talking about getting engaged I gave it no further thought. My girlfriend and I were going to a motel afterwards to spend the night. I’d already paid for the room and had the key in my pocket and I was ‘kinda anxious to leave the party and get started with our real fun!
My girlfriend had a few drinks and as the party wore on I noticed she wasn’t in the living room any more – she’d disappeared, but I gave it no thought – just figured she was elsewhere in the house, or went to the store with her pals, etc. I didn’t know it yet but she was in a bedroom upstairs having sex with her former boyfriend.
She reappeared after an hour or so, as if nothing had happened and we said goodbye and left. She was a bit “tipsy” but still conducting conversation and I was just horny as hell. When we arrived at the motel, I had to help her get undressed and as we got in bed I immediately started kissing her and trying to initiate sex. She seemed to be enjoying it, but as my hand slid between her legs my fingers were sliding into a well lubricated vagina. The ops of her thighs were wet and slippery - she was leaking cum. She pushed back a little and said “you don’t want to go there tonight, I’ve been bad.” I instantly understood what had happened earlier and my cock was harder than I ever imagined it could get. It was like throwing gas on an already raging fire. And the more she tried to convince me that I didn’t want to fuck her, the hornier I got. As I moved on top of her she coyly posed no resistance as we began making out and my cock slid in without me even touching it. I was excited beyond belief that another man had just made love to her. As I looked at her underneath me, every feature of her body seemed to stand out, ready for sex. And although she didn't say as much (and even denied it), she too, was ready for sex.