When I was 18 I had never thought about having a threesome... My boyfriend and I had just started having sex about a year ago for Gods sake!
Steve, my boyfriend, was 22 and would always take me to parties at the college that he went to which usually ended up with me drunk and us making out at the party then going back to his place for some incredibly hot sex. We never had sex at the parties, I just didn't feel comfortable around other people like that which is what makes this experience so unusual.
One weekend we went to a party down at one of the frat houses, Steve and I had been drinking at his place before we left so I was a bit buzzed and we hadn't had sex in probably about 2 weeks so I was super horny. In the cab on the way there Steve was teasing the shit out of me, rubbing my thighs, kissing my neck lightly and rubbing his fingers over my pussy so lightly, just enough to tickle me and drive me nuts! By the time we got to the party I was ready to jump his bones but he didn't seem to notice that I was so horny, I would have had sex with him in the middle of the living room if he had suggested it at this point. As I say though, Steve did not notice how horny I was and he got me a couple drinks and went around to say hi to all of his friends.