I was twenty-two when it started, home from college for the summer and staying at Grandpa's big old house out in the country. Mom thought it would be good for me to help him around the place. She had no idea what kind of help I was going to end up giving.
Grandpa was seventy-three but still solid, thick arms from years of farm work, a white beard, and a stare that made my stomach flip whenever he looked at me too long. The first night I caught him watching me in the shower through the cracked bathroom door. I didn't close it. I soaped my tits slow, spread my legs and ran my fingers over my shaved pussy while he stood there. When I came out wrapped in a towel he was in the hallway, cock already bulging his pants.
"You like what you saw, Grandpa?" I asked, voice low and filthy.
He didn't answer with words. He grabbed me, spun me around, yanked the towel off and bent me over the hallway table. His rough hand slapped my ass hard. "Been waiting years to see this tight little cunt," he growled. Then he spit on his fingers, shoved two inside me and finger-fucked me until I was dripping down my thighs.
I heard his zipper. His cock slapped against my ass, hot and heavy. It was thick, veiny, the head already leaking. He didn't ask. He just lined up and shoved it straight into my cunt in one rough thrust. I cried out, half pain, half pure need. Grandpa started pounding me right there, balls slapping my clit, one hand fisted in my hair, the other gripping my hip hard enough to bruise.
"Fuck, Grandpa, your cock's so big," I moaned. "Stretch my pussy."
He grunted and fucked harder, the table creaking under us. "This is what you get for teasing an old man, girl. Gonna fill this cunt every night you're here."
He didn't last long that first time. He buried himself deep, groaned, and pumped a huge load inside me. I felt every spurt. When he pulled out, cum ran down my legs. He scooped some up with his fingers and pushed it back into my pussy. "Keep it in there. Want you leaking me all day."
After that it was constant. Mornings I'd wake up with his face between my thighs, beard scratching my skin while he licked my clit and tongue-fucked my hole. Afternoons he'd bend me over the kitchen counter and rail me while dinner cooked. Evenings he'd sit in his recliner and make me ride him, my tits bouncing in his face while he sucked my nipples and called me his dirty little granddaughter whore.
One night he brought out lube and told me he was taking my ass. I got on all fours on his bed, reached back and spread my cheeks for him. "Do it, Grandpa. Fuck my ass." He worked two fingers in first, then three, stretching me open while he stroked his cock. When he pushed the head inside I saw stars. It burned, but I pushed back until he was balls-deep in my ass.
He fucked my ass slow at first, then faster, reaching under me to rub my clit. "Such a good slut for Grandpa. Taking it in every hole." I came so hard I squirted on his sheets. He followed right after, flooding my ass with another thick load.
By the end of the summer I was completely addicted. I'd crawl under the table during breakfast and suck his cock while he read the paper, swallowing every drop. He'd wake me up at night by sliding into my pussy from behind and we'd fuck until the sun came up. He taught me to love the taste of his cum, to beg for it, to let him use every hole whenever he wanted.

On my last night he fucked me in the shower, against the wall, then carried me to bed and ate my pussy until I screamed. When he finally slid his cock back inside me he looked me in the eyes and said, "This cunt belongs to me now. You come back next summer, you hear?"
I nodded, already clenching around him. "Yes, Grandpa. It's yours."
He came deep inside me one more time, and I fell asleep with his cum still leaking out of me, already counting the days until I could come back for more.