Greg stood at Kristin's door stroking his cock. She was naked on her knees and elbows with her asscheeks pointed right at the door.
Kristin looked back and giggled.
"Don't get mad," Greg said, moving towards her.
Kristin giggled again, twerking her buttcheeks. "Happy birthday," she said.
"For real!?" Greg took hold of her hips and guided his aching cock into her wet pussy before she had a chance to change her mind. He sighed and moaned. He sunk his cock as deep as he could then rolled his hips grinding the head of his cock into her depths.
Kristin moaned, rolling her asscheeks back against him. She moved as if she was doing a seductive dance.
Greg gradually moved into a slow stroke increasing the tempo steadily. Within minutes he was pounding her with abandon.
Kristin knew that Greg would love fucking her for his birthday present. She had it in her head that she would give it to him. She was glad she did, feeling her orgasm explode. It was exactly what she wanted.
Greg kept going like he couldn't get enough. He reached around her massaging her full tits and kissed the back of her neck.
Kristin moaned out another orgasm and felt she could have another. She knew she should have allowed him to have her one of the many times he had tried, but this was worth the wait.
They both were grunting and moaning in the throes of sex when they heard the voices and their mother calling out for Greg.
Kristin drove off the side of her bed, ducking down putting her legs into her thong. Her heart was beating a mile a minute.
Greg hopped around trying to stuff his huge hardon in his pants. He slipped out of Kristin's bedroom and gave himself the once over and ran his fingers through his hair. "Coming mom!" he called out.
"Give me a hand with these," Alina asked.
"No problem," Greg said and grabbed her hefty braless boobs that were pouring out of her thin spaghetti strapped top.
Andy laughed.
"Don't encourage him, Andy. I shouldn't have to fight off my own son," she said.
"Just playing mom," Greg gave her a kiss and took the shopping bags from her hands.
"You can't really blame him honey," Andy said. He slapped the bottom half of her asscheek that hung out of her boy shorts.
"I don't think he's playing Andy. I don't think he's going to stop until he is fucking me," Alina said.
"And what's wrong with that?" Andy replied.
"We would be in a world of shit. That's what," Alina complained.
"It's not like he's doing it in front of anybody. He's not an idiot," Andy said.
Alina rolled her eyes.
"Heeey!" Andy protested.
Greg kept unloading the groceries, relieved that he wasn't caught with Kristin.
"Alina, I tell you. If I had a hot mom like you, I would have never run away from home. I'd never want to leave her, and yes, I'd want to fuck her too," Andy said.
"Hey, how about I make us some margaritas?" Greg said, hearing the tension in their voices. "I bought two gallons of the good stuff on my way home from work yesterday to celebrate my birthday.
