Undersized tiny shorts and a loose tank top

Your heart was racing as you heard Carrie walking down the hall. You started bracing for the worst, expecting a massive fight between your girlfriend and grandfather that ended with everyone angry and a rough few nights ahead in your relationship. You were blown away when Carrie walked in beaming with confidence, a massive smile on her face. Sporting a pair of nearly skin tight shorts that clung to her ass and a tank top that hung loose and showed off a massive amount of cleavage, she looked breathtaking.

"Better?" she asked with a coy edge to her voice. She gave a twirl as she walked over to model herself in front of the couch for your grandfather.

"Much better sweetheart, much better," he said approvingly before placing his beer on the table. His eyes wandered her body as you could look over and see a clear tent starting to make itself more noticeable in his sweatpants. Carrie was clearly enjoying herself more now as her eyes went between you and your grandfather.

"I don't normally dress like this since guys tend to ogle me and be total horny pervs!" Carrie said, giving a tiny bounce after that made her tits jiggle, "but since it's just the best boyfriend in the world and his sweet old granddad here, I guess I can dress like this more."

"Who you callin old? Damn young whippersnapper!" he said playfully, "I oughta bend you over my knee and spank that tight little ass of yours for that remark!"

"Oh you wouldn't!" Carrie said, biting her lip after. Being spanked was Carrie's biggest turn on, and she wasn't doing a great job of hiding the fact that she was suddenly into the idea of him doing it. Your grandfather didn't need any more encouragement though as he stretched forward and grabbed her wrist, tugging her towards him on the couch. Carrie was giggling as she went along with it, bending over his lap as your grandfather settled back into his seat. You watched as your grandfather's hand ran up Carrie's leg, arriving at her ass. He gave one cheek a squeeze, then slowly moved to the other and did the same.

"Yep, this is the perfect ass for spanking. And for other fun things," he said. He pulled his hand high and slammed it against Carrie, eliciting a yelp. Then he did it again, each smack of he ass echoing through the room.

"Fuuuck," Carrie moaned lightly, her nails digging into the cushions of the couch. Whether your grandfather heard her or not, he continued on and seemed to only hit her harder with each slap. Carrie was quivering and trying not to moan louder as she moved one hand over her mouth, and it became abundantly clear that your grandfather was turning your girlfriend on. A lot.

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