Pretty fucking obvious.

“What are you doing tomorrow?” Frank texted Nat, later that evening.

“Hopefully you ;)” She replied. Sending with it a naked photo.

“Come over. Bring your sexiest bikini.” He texted back, a shit-eating grin plastered on his face.

Frank decided that had would try and give Nat as much jizz as he could so that he could measure the changes it made in her. After all that’s what Tas had asked him to do, you know, for science.

Nat arrived the next morning bright and early and Frank could already see that Nat’s appearance was changing. Whereas on Thursday he stomach was slightly rounded, he now noticed not 48 hours later that she was looking thinner.

“Wow you look great.” Frank glowed, “Have you been working out?”

He knew the comment was dumb, any sort of physical exercise couldn’t have shown such fast results. But the intention was to see if she was noticing the changes her body was making.

“Thanks,” She said blushing, “I think I’m losing weight, but I sure as hell haven’t been working out.” Nat joked at her own expense.

Frank laughed at her joke with her, but felt a sense pity for the older woman as she clearly didn't see herself as the beautiful woman she was. They kissed and hugged before they made their way out to the backyard. The yard wasn’t large but one of its best attributes was the pool. It wasn’t large either, at about twenty feet square, but it was always a hit with guests. They made small talk whilst they changed into their swimsuits and Nat eventually turned things sexual.

“So how many loads will you give me today?” She beamed, taking off her sundress to reveal a racy blue bikini.

Frank admired her choice in clothes so much that he almost forgot to reply for a moment, “As many as you’re willing to work for.” He winked.

They dived into the pool, splashing each other like children. The temperature of the water was cool, making their teeth chatter. Nat folded her arms across her chest, in an attempt to get warm and inadvertently gave Frank a great view of her cleavage. And with her erect nipple poking through the fabric, little was left to the imagination.

“Like what you see, young man?” She smirked, and pushed her tits together firmly.

Frank was beginning to feel the frenzy of horniness that he had felt on Thursday afternoon, and before he knew it he was sitting on the side of the pool and had pulled his cock out of his trunks.

“I will take that as a yes.” Nat laughed, eyeing him up as he played with his huge manhood.

She approached him and without question began to guzzle on his knob. Nat placed her hands on his knees and feasted on his meat, hands free. She sucked firmly for a few minutes on his tip, nurturing the snake between his legs like a lollipop, before trying to go further. Frank obliged her and pressed the back of her head down into his lap. His dick probed the MILF’s throat; he could feel her fighting to get it down. She pulled away, gasping for air, saliva drooling out of her mouth.

“Are you going to swallow?” He asked her in a stern tone, almost as a parent would ask a child to eat their vegetables.

She nodded with a grin and returned to sucking feverishly. It didn’t take long before he needed to burst. Her warm mouth in contrast to the icey water was incredibly stimulating. Feeling Nat’s tongue on his shaft threw him over, pumping his juices into her trap. She dutifully swallowed; leaving no drop wasted and then looked up in approval.

“Good girl.” He breathed, stroking her wet hair while she continued to suck on his still pulsing meat. “Take this inside?”