She does it.

Despite every bit of humiliation you felt, you also felt another feeling. Horniness. Your 3 inches of shame was twitching as Zoe was staring wide-eyed at it like it was the most adorable little thing. You know if you touched it, it would immediately pop like the world's smallest firework.

"Zoe please, give me something to wear." you said, trying not to breathe too hard in order to hide the fact that you were turned on.

"Why is your weenie twitching like that?"

"Zoe!"

..."You didn't answer my question, Sam. Do you want me to rub that weewee with lotion or do you want to do it?"

For some reason the word weewee made your dick throb. At that moment you couldn't take it any more. This weird girl had you at her mercy. You could only pray that she'd keep her end of the bargain as you whispered, "...d-do it for me..."

With a giggle she took her hand and got a bit of the sunscreen pooled on your crotch and went to work. She tried to use her whole hand at first but she really could only wrap two fingers and her thumb around it.

It was obvious that actually coating your dick in sunscreen was low on the priority list as, while she made a token effort to rub your whole crotch with sunscreen, including your balls which didn't exactly help you not feel like your dick was going to explode, she kept going faster and faster as she rubbed the lotion in.

She was basically giving you a handjob in all but name. You bit your lip trying not to burst but with you squirming and breathing hard, it was painfully obvious to everyone, including Zoe, that you weren't going to last much longer.

Without stopping her rubbing, even for a second, she laid down next to you, giving you a view of several women staring in shock and titillation at this display.

"What's the matter Sam? Getting excited? Is that tiny baby weewee about to burst?" whispered Zoe mere inches from your ear with a sultry look on her face that you didn't think she was even capable of.