Finish you with her hands

"...keep rubbing?" she asks, running her hand up and down your length.

"That would be, uh, amazing," you say. Her strokes were a little uncomfortable at first, but now she's got a good amount of precum on her hands, and each time she runs her hands down your shaft, you feel a little jolt of pleasure.

Mary starts to industriously give you a handjob, still curiously looking at your dick like it's from outer space. As she pumps, you gently give her a few pointers, and soon she's stroking your cock like a professional. She's rubbing you with enough **** that she's starting to rock back and forth, and you notice how her tits jiggle in her tight t-shirt.

Soon, you feel pressure start to well up in your balls. "Mary, I'm about to..." you say, finding it difficult to form words.

"Is everything still ok?" she asks, still pumping away on your cock. You're to busy concentrating on not cumming to speak, so you grab her head to move her away, but instead accidentally end up holding her right in front of your dick. You sigh, muscles twitching, as several thick ropes of semen land on Mary's freckly face, around her nose and mouth. She intently watches your dick spasm with her green eyes.

"So this is sperm?" she asks, wiping a little off of the bridge of her nose with a fingertip. "It smells kind of gross. Is that normal?"

Before you can answer, you notice a noise outside of the storage closet...