"Lesbian fairy sex?" You ask. The fairy nods to confirm it. "Alright, I'm in!"
"Well, that's surprising!" The fairy said. "I've never known a teenage boy so willing to become a fairy."
"What can I say, we've all got our fetishes, mine just happens to be fluttering before me right now."
The fairy giggled and waved her wand sending a thick pink cloud of glittering dust at you. You can feel yourself shrinking quickly, your body suspending in the air as it does. Facial and body hair vanish as your clothes slide off your thinning, and shrinking frame. Your face changes into a smoother, rounder shape as your ears become longer and pointed.
The sensations across your body start to become arousing. Ample breasts, for a fairy at least, bulge from your chest; your back begins to stretch out and peel open, allowing tiny sheets to push forward and slowly expand into large shimmering fairy wings. Finally, your testicles shrivel and vanish; and your erect penis changes into a flower bud that slowly bursts into bloom.
The sparkling cloud bursts and gravity takes hold of you again. Instinct takes over and you catch the air with your new wings as you gently land on the bench, your wings continuing to flutter after you touch down.
You look down and take your floral erection in your hand and feel it. You let out a few moans and you realize you're doing the fairy equivalent of masturbation. "Whoa, there; save some for me!" The fairy said. "We wouldn't want your pistil to fire too soon now, do we?"
You giggled at the pun. "No, we wouldn't." You say as you approach the fairy, ready to meet your flowers and do the fairy nasty.