She can't reach anything

Still gently squeezing your dick, she turns her head away to reach for the plastic cup.

"Uuuugggghhghnnnffff . . . . " you moan as a glob of semen spurts from your cock and lands on her cheek. She abandons her effort to reach the cup and quickly engulfs your dick with her mouth.

You commence to spurt your seed into her mouth as she releases your hot penis. You look down at her lovely face as she gulps down your sperm, the jism on her face slowly sliding down her cheek to her chin.

After you are through, she pulls your dick through her closed lips, cleaning your cock. You grunt as your sensitive head slips past her lips and out into the open air.

"Shoot!" she says. "Well, John, I don't think we have enough here for a full sample." She says as she wipes your cum off her chin with her fingers. "Maybe next time." She licks her fingers clean of your seed and starts to put her bra and her blouse back on.