The redhead.

You point at the redhead, who has been looking at your curiously, if a little tentative. She's wearing a flannel shirt, which almost conceals the curves of her small breasts. Her jeans still reveal the pleasant form of her legs though, and there's something about her that intrigues your curiosity.

"Sophia?" Diana asks, "Would you be willing to remove some of your clothes, so we can see how Joe's penis responds to visual stimuli? Men are notorious for being more aroused by visuals."

Sophia turns bright red at the idea. Her friends encourage her though, so she asks you, "What do you want me to do?"

Diana interrupts, "this is your experiment, Sophia. Take off whatever you want, and see how he responds."

She nods, still looking a little nervous. But then she turns to face you, and begins unbuttoning her flannel. Three buttons down and the smooth skin of her chest begins to reveal itself, the inner curve of her right breast making you wish for more. You feel your cock start to harden further, and Sophia notices.

She smiles a little, and speeds up the unbuttoning of her shirt, eyes darting between your face and your cock. Pretty soon she's fully unbuttoned, but she doesn't take it off yet. You can tell she has no bra, as the inner swell of both her breasts are now visible. You find yourself absentmindedly brushing your fingers along your cock as you wish you could see her nipples.

As you touch yourself, a flush of red rushes to her chest and cheeks. You will her to take her shirt off completely, but instead she unbuttons her jeans, quickly slipping them off so she's just sitting there in her white panties. As you predicted, her legs are amazing, they are curvy and toned at the same time.

You're full on pumping your own cock now, still willing her to take off her shirt so you can see a full view of her breasts, but now also wanting to slip your hands between her legs.

"Take off your shirt!" You say, "Oh man, if you want me hard, please take off your shirt!"

"It looks like you're fully hard already, Joe." Diana says, "Good job, Sophia!"