Let him surprise her

With his finger buried in her ass and Carrie's hand working his cock, your grandpa looked like he was in heaven. "Mmm fuck, I haven't came in a few weeks, and I'm all backed up. I can tell you like how much I leak. Why don't you open that pretty mouth of yours and take a lick?" He stammered through his staggered breath. At first, her face showed hesitation, but she opened her mouth and ran her tongue up his already wet cock.

The look on her face told you that she was not a fan, but that just made you harder. Before she could close her mouth, your grandpa, still holding her by her hair, shoved his cock deep into her mouth. She tried to pull back off of it, but this just pushed her ass harder into his finger, causing her to squeal, her voice muffled by the hard dick that filled her mouth. "Ohhh baby, yeah that's real nice. Just let me have your mouth. Mmmmmm," he purred as he pumped, undoubtedly covering her tongue with more of his precum. Surely he'll tap, right? Within ten seconds of being in her mouth and without any warning, he let out an animal groan. "Hngggggggg yessss."

His cock began to pulse and flex as Carrie's feet kicked, whimpering as wave after wave of cum filled her mouth. You watched as her throat bobbed, attempting to swallow the incredible amount of cum being pumped into it. Groaning and bucking for what seemed like an eternity, cum began to escape her lips, running down his shaft, and when he finally withdrew his finger from her ass and released her head, she lifted her head from his cock, and an entire mouthful of semen bigger than any of your loads spilled out onto his cock and down her chin.

Catching her breath, you saw a mixture of shame, embarrassment, and anger on Carrie's face. "What the fuck, old man? What is wrong with you?!" She demanded.

THWACK! A hard spank came down on her ass and she yelped. "Now look here you little slut. I live here now and if I want to fill that pretty mouth of yours, then I will. And you don't say a damn word, boy!" He snapped before you could speak. "Look at all you wasted, too. Did I tell you to spit?"

He grabbed her by her hair again and pulled her head down to his thigh. With his fingers, he scooped up a literal handful of cum and shoved it into her mouth. "Now SWALLOW IT!" He barked. Her rebellious streak dashed, she complied, sucking the cum off his fingers. "That's right, I know you love it," he said, smearing the rest of the cum on her shorts. Now take this sweet lil' ass into the kitchen and start dinner. I have a friend coming over.

Wiping cum from her mouth , Carrie turned to you with a look of betrayal, but when she saw the growing stain of precum in your pants, it washed away, replaced by arousal that you were getting off to this. With a wink, she turned back, feigning resignation. "Yes sir. I'll start dinner."

"Now, that's what I like to hear! Son, you've got yourself a real winner there, if she could control that temper. Oh, and honey," he said, grabbing her wrist as she walked away. "These nuts are usually full again in a couple hours." With a wink and a slap on her ass, he got up and walked into his new bedroom.