How could she resist?

"Miss Wilson. I want to f..." Jeff swallowed hard as she took his cock deep in her throat.
"Use your words, Jeff." Beth stroked his cock and smiled. She had a momentary pang of guilt: she could feel her engagement ring sliding against his hot flesh. But as she looked at the sculpted specimen in front of her, the pang faded away. How could any sex-starved woman be expected to resist this?
"I want to fuck you, Beth."
Jeff led Beth into a small supply shed where he kept his baseball equipment. He threw a padded mat onto the dirt floor, and covered it in a towel.
"Such a gentleman." Beth whispered before sliding down her jeggings and getting on her hands and knees. Jeff wasted no time: he ate her pussy from behind until she was ready to cum from that alone and then buried his cock in her for a fucking more vigorous and frantic than she'd had in a long time. She orgasmed fairly quickly: the forbidden nature of the act combined with his youth and girth were too much for her undersexed vagina to bear. Jeff didn't last too long either. She supposed it was a small downside of his youth. He came on her ass and wiped her down with a towel.
They lay together in a sex daze for a bit, kissing and cuddling. Neither of them mentioned the wrongness of the act, and before long, she noticed that Jeff was rock hard again.
"Jesus, Jeff. Already?"
"You... you want to...?"
"Fuck..." Beth climbed on top of him. She wasn't going to waste such a resilient cock. A second load found its way inside her snatch this time, and then the two of them cleaned up.
"What are you doing on Sunday?" Jeff asked, a touch out of breath.
Beth paused while pulling on her blouse. Brian was going to Mason's house for poker on Sunday. "I don't know, why?"
"Me and some of the guys from the team are playing some ball in Miner Park. Maybe you could come watch... and after?" He smiled, and she remembered that despite his amazing cock and sculpted body, he was a 19-year old kid. "Hey, I get it." He blushed. "You've got a man already. I understand, it's cool. This was a one timer."
Beth thought for a few seconds. I really shouldn't encourage this. I've already fucked up badly enough.
"I'll think about it..." is what she ended up saying. The memories of the cock that wouldn't quit filled her thoughts, still.
She drove home with mixed emotions. I'm sorry, baby. I needed it. It was a one-time thing. But she couldn't get that young body and resilient cock out of her brain.