I have this fantasy about my two female room mates. I haven't acted on it yet, but would in a heartbeat if given half a chance.
I come home and find you and she are sitting alone together, talking. You have both had a couple of drinks and are very relaxed and a little buzzed. You start to kiss and fondle each other passionately.
What the two of you don't realize is that I'm hiding in the doorway watching the whole scene. I watch as your clothing becomes a pile in the corner. You are now both completely naked and locked in an erotic embrace. The two of you are so into each other you don't even notice me as I start to stroke my now very hard cock as I watch the show.
You play with each other for awhile before moving to the floor and assuming the 69 position. You are on top and the two of you have your faces buried in one another's wet pussies. I continue to watch until I can stand it no more. I move up behind you and kneel down. I can see your roomie licking and sucking on your hard little clit. I push my hard cock into that tight pussy of yours from behind, while she is licking you.