You hesitate

"I...don't know if I should..." you say lamely. Your cock grows. Kayla thrusts her tits out to you a little more.

Eve's doing her makeup when she says, "What why? Just be a friend, John, and see if the makeup comes off her breasts when you play with them." Your eyes bulge from their sockets and your dick bulges in your pants. Did your girlfriend just give you the green light to feel up her friend? You cautiously reach out to grab Kayla's boobs, your eyes watching Eve's through the mirror, but she only glances and smiles at you before focusing back on her makeup.

You squeeze and play with them a little bit, before she pulls away and says, "Alright let me see your hands." You show them to her - no make-up came off. "See Eve I was right!" Kayla says smugly. She turns away but you grab her arm.

"Yeah but you know guys are going to do much more, right? Probably need a more thorough test," your dick is running the show now and you press your luck. Eve even chimes in her agreement!

Kayla sighs and takes position in front of you again, and you start biting one nipple hard enough for her to flinch, pinch the other one roughly with your free hand. After 30 seconds you switch. Your cock is painfully hard at this point. She eventually says, "Uh ok, I think that's probably good enough..."

You pull away and look in the mirror, seeing no makeup. Kayla sees this too and is satisfied. She turns away from you again intent on finishing her makeup.