Cheyenne notices your erection.
From Create Your Own Story
"Wow, is that your phone? You have some really deep pockets!" Cheyenne exclaims, reaching for the head of your cock without knowing it.
Before you can stop her, she makes contact and squeezes a little to see where the pocket ends; you groan a little under your breath and she stops, shocked. "...Is that your dick?" You nod, not sure what to say. Cheyenne gets flustered immediately. "Oh, my... I'm so sorry. I didn't think it could be, I mean, it's so... big! And so far down your leg..."
You can tell she's getting curious about the size of your cock, so you say, "It is kind of big. Would you like to go somewhere and see it?" She nods, breathlessly.