I smirked as Ava gave up the ghost and started actively masturbating. One hand reached up to start squeezing one of her enlarged breasts, while she plunged several fingers of the other two-knuckles deep into her pussy, pumping them in and out. Her head leaned back, eyes rolling around and mouth hanging open, drool starting to spill down her chin.
"God, that's hot," I muttered, feeling my pants straining tight against my huge boner. I was considering making a wish so no one would care about me masturbating in public either, so I could really enjoy the show, when I was distracted by a piercing shriek. Ava's back arched, jaw widening further as she screamed in pleasure, and a small fountain of cum exploded out of her, spilling past her hand and forming a puddle on the sidewalk below her.
As Ava panted for breath and slowly came back to her senses, I merely smirked and stroked my erection lightly, considering what to do next.