One of my fantasies is meeting a female friend for cycling. Her being just a little bit older and sexually deprived overtakes her self-control when she sees me in my cycling suit. She somehow overpowers me, ties me up, puts on a strap-on and pegs me through my cycling suit.
Or another scenario is that we're both cycling and we take a break, only to be mobbed by some other cyclists. We think that they're going to do stuff to her when they tie her up after holding us both down, only to have her be tied up against a tree to watch as the group of guys start pegging me, again in my cycling gear. Even though she tries yelling for them to stop, her being sexually deprived makes her enjoy the show while I get humiliated and worked on.
Afterwards, I'm left in a hot goopy mess, with my friend having a front-row seat!