On her stomach

You couldn't take it anymore. Her unprotected pussy was milking your cock, and you had to do something. You clenched your legs as you felt yourself about to cum, pulling out of her just as the first rope shot inside, coating her entrance. You could feel her slick cum lubricating your cock as you jerked off, spraying rope after rope across her stomach.

You groaned as you unloaded every last drop of stored cum, your balls literally felt lighter. You loosened your grip as your orgasm subsided, your balls spent. She reached down and rubbed her clit, feeling your cum around her vulva, moaned.

"You pulled out in time, right?"

You sheepishly looked at her, wiping your brow, and said "yes". She looked like she didn't believe you, but she still gave you her number. "Text me later, cutie!" she said as she got dressed and left, leaving you alone to return to the party.