A generous supply.

"Hell yeah I would baby... just let me get there, and I'll paint your face." I fucked Jane's pussy harder, but slowed down when she grabbed one of the filled condoms.
"You can fuck me while I'm covered in jizz right now, baby... you don't have to wait..." she gave me a filthy smile. I couldn't believe my ears.
"But... that's not my cum..." I didn't want to admit it, but it didn't really matter that much. I did want to fuck her while she was absolutely covered in cum, and there was no way it was going to be mine. I couldn't possible produce that much.
"It's not like the guys are here, fucking my holes and then cumming on me themselves...." she licked her lips, and then smirked. She handed me the condom. ""Cum" on my face, baby." It was such a dirty suggestion. I couldn't refuse. I tore the condom open, and drizzled it on her waiting face. "Mmmmm yes.... yes baby...." she writhed in pleasure as the cum dripped onto her upper lip and nose. She tilted her head back to take the last drips in her mouth. "More..."

As I fucked her naughty pussy, condom after condom was emptied onto her pretty face. It only made it prettier.
"Paint me baby... Oh, I'm just imagining getting fucked by you while your friends jizz on my face!"
"I'm surprised that I was wrong about them."
"Mmm... what's that, baby?" Jane wrapped her legs around my hips as I fucked her.
"Well, clearly at least three of my friends wouldn't fuck you, given the opportunity." I said. "Guess I was wrong."
"Yeah...I guess so..." Jane smiled. "You're friends are better than you thought..." The cum was running down her face, now, onto her neck and into her ears and especially her mouth. She didn't seem to mind the taste at all. "More... I want more."

Eventually, the sight of her slutty face positively bukkaked with my friends cum was too much for my poor cock, and I pulled out to add my own load on top.
"Mmmm....It's too bad you fell asleep baby, it would have been hot to act this out for real."
"Yeah." I knew she was kidding, but I couldn't get that image out of my head as I shook the last bit of cum onto her face.