There's a couple I have
One is a dumb CNC fantasy. I'd love to have a girl walk up and give me her address, schedule, and a message that just says "Take me" or something. I want to break in during the middle of the night, tie her down to her bed while she sleeps, and have my way with her over and over until neither of us can take it any longer.
I'm into pet play and would love to get a girl completely dressed with ears, tailplug, collar, sexy lingerie, etc and guide her outside. I want to fuck, suck, lick, use, and, uhm... cuddle her in the grass outside somewhere. The dirtier part of this is that I'm into watersports and would love to piss on her, make her drink it, spread her while she pisses, etc (which is all less sexy listed out of context haha).
Another is just to get a couple girls to make sexy bets on video games or something. Casually hanging out as we all make dirtier bets and get more naked/horny. I'd love to take turns doing more and more to and with each other, maybe taking it into public or just having fun together.