"Can I touch it?"

You're a little taken aback by her forwardness, but she seems nice enough. "Sure," you say, "but we should probably go somewhere a little more private."

"Oh, yeah, I know just the place," she says, taking your hand and leading you to a storage closet at the end of the row of lockers. As you walk, you can't help but admire her trim figure. Even though she's slim, her ass fills out her tight shorts nicely.

She shuts the door, breaking you out of your reverie. "So should I just grab it?" she asks, as she pulls your boxers down. Your start a bit as your half-hard dick springs upwards. "Oh, sorry!" she says, pulling her hands away in surprise. "I should slow down a little, I guess."

"No, it's fine," you say, gently grabbing her hand and bringing it down to your crotch. "I just can't believe you've never learned about penises before."

"I don't get out a lot," Mary says absentmindedly, as she starts slowly stroking your dick. "With guys, anyway. It's so veiny. Are all of them like this?"

"Just about," you say. It's been a while since you last came, and Mary's clumsy rubbing is really starting to turn you on, so you let out a soft groan.

She stops rubbing, and looks up at you with concern. "Is everything ok? Am I hurting you?"

"No," you say, "it's just that when I get hard like this it's not really comfortable to get soft again without cumming.

"That's like when it shoots out sperm, right? We learned about that in health class." Mary says. She kneels down and looks at your dick. "Maybe I can help. Do you want me to..."