"No, I don't think so," Stephanie replies, an innocent smile hiding her secret intentions. "I get lonely, here. Males don't come by often and I want some company," she says, approaching you once again.
Stephanie gets down on her knees and leans back into you crotch. Your erection hasn't waned since your previous interactions, and she takes advantage by placing her latex muzzle over your penis and sucking softly. Your previous feelings of fear and concern are replaced by relaxtion and enjoyment. Her plastic hooves and long, smooth arms rub your legs in rythym and you can't help but deny you're enjoying this. You look down at Stephanie's head between your legs, her smooth chestnut exterior and thick mane, and suddenly your thoughts are changing rapidly. "I want to stay with you," you groan, engrossed in pleasure. "I want to be your stallion."
With that, the changes begin. Suddenly, you can't hear anything, all sound mute. You panic briefly, but soon your hearing is restored, now by way of two short latex pony ears sticking up from you hair. You feel your spine changing as a tail makes it's way out above your ass. You feel like you're about to orgas, but Stephanie stops and stands up.
She laughs in her own cute way, noticing your new features. "You look adorable," she says. "Now for part two." She sits on your bare leg, sliding along up your knee, her smooth ass feeling great against you skin. She then sits on your erect hard-on, your penis entering her soft latex female organ. Her back is pressed against your stomach as she moves herself forwards and backwards in gentle motions.
With new pleasures come new changes, and indeed your changes progress.