A challenger approaches!

Lisa spent an hour or so, lounging in the sun like a snake on a rock. She flipped, occasionally, from her back to her belly and back again, half asleep, relishing in the sweet sunlight. Her elegant, athletic glistened with sweat as it tanned. Every inch of her body had been lasered hairless, save for her head, long and blonde contrasting perfectly against her perfect tan. Her body was toned tightly from years of gymnastics and cheerleader position in high-school, though she took **** efforts to remain in good shape eve after graduating. She took great pride in her body, especially her breasts- immaculately perky despite their size- and her legs- eye-watteringly muscled and toned. Once, while drunk at a party, she had crushed a cantaloupe between her thighs.

The leaves rustled, and she opened her eyes to see a boy in cargo pants and a tank-top flopping over the wall. In an instant her heartbeat doubled, from languid to panicked. She tried to get her her feet, only to flop weakly against the patio-stones.

The boy- about her age, maybe a year younger. Possibly a just-graduated high-schooler, in the summer vaccation between high-school and college. He skittered back, terrified of her. He had a boyish face, but an unmistakably masculine build, well muscled yet lean under his clothes.

Lisa nearly screamed, but stayed silent. Her getting loud would draw even more attention. She wanted to avoid that if she could. The sight of the young man, the feeling of his gaze flowing over her nude body, made her feel even hotter than she had before.

"Um..." He said, squirming slightly... "This is going to sound odd, but... have you gotten any strange letters recently? With... weird things written in them?"

Her stomach dropped.__

"Yes." she said slowly. "A letter with a... challenge written on it?"

He nodded. "It said that I would find a girl here. That I was supposed to..."

Lisa tried to assume a more sexy pose, difficult considering her state.

"To do what."

"...ckhr..."

"Excuse me? I couldn't quite hear that?"

"Fuck her." He looked up at her, sheepishly. "May I fuck you?"

He seemed like a strapping lad, and she always had a thing for shy boys. She _loved _making them terrified of her, of her combination of beauty and strength. She loved riding atop them as they squirmed helplessly under her, or grabbing them by their hips and fucking herself with them like they were just toys.

But now she was tied up and powerless. It terrified her, only served to make her even more ferociously horny, which in turn terrified her even more. This was a side of herself she had not known existed yesterday, and already it threatened to consume her.

Still, he was a nice looking man. She bet it would feel amazing for him to fuck her, too. To squrim powerlessly under him as he choked her and slapped her and mashed his flesh into hers over and over and over and over and over-

Wait. Even drunk, even rolling on X at the club, she was never this horny, unless.

She was about to ovulate. Sometimes she would get absurdly horny the day before she ovulated. Not every cycle, but when it came, it came with a vengence.

She was excessively, dangerously fertile. Her body reacted pooly to every form of birth control she had tried. Her voracious sexual apatite had been kept in check by her religious use of condoms and the meticulous counting of days.

But the risks were impossibly high.

When she did not answer, he began to undress of his own accord. He pulled his shirt off, revealing a well-muscled chest, and dropped his pants, revealing toned legs and a majestic cock. A solid six-and-a-half inches, and girthy. She had never fucked while ovulating before, but she had pleasured herself on those days incessantly, wringing from her body the strongest orgasm's a human being had ever experienced. Fucking this man on this day would easily be the highlight of her life thus far.

"Does this change your mind? The challenge said that something really bad would happen to me if I failed."

Underneath his elegant cock stood a proportionate pair of balls. In her mind's eye, she could see them churning with potent seed. She would fall pregnant for sure if he came inside her. No doubt.

But then she looked into his puppydog face, saw the strange mixture of shyness and hunger.

"I'm not on the pill or anything. Got any condoms?"

He shook his head.

"There's a pack in the medicine cabinet. Just open the door and go in. I'm a little tied up right now."

The youth stepped up towards the door, his elegantly muscled body rippling, already beginning to sweat in the afternoon summer swelter.