On her.

As much as you would love to empty your balls in her, you decide that you do not want to risk it in case she is not on birth control. Just in the nick of time, you push yourself off of her and your cock slips out of her hot cunt right before it starts spurting thick gobs of jizz on her belly and tits. You stroke your slick shaft to make sure the last drop is on her.

"Oh my God, that was so fucking hot!" she purrs.

"Yeah..." you groan as your cock starts to wilt.

"Thank you for not cumming in me," she smiles as she slides off the couch to kneel in front of you, "but it's okay because I'm on the Pill." You sigh when you feel her warm mouth around your limp cock as she sucks it clean.

"Sorry about the mess," you mutter, looking at her breasts plastered with your cum.

"It's okay," she giggles. "It just means I'll need another shower!"

You watch her stand up and sway her wide hips seductively as she walks towards the bathroom.

"You're not coming?" she smirks at her own double entendre.