Fucking my dad's friend was always a fantasy of mine. It started when I was just 12 years old, watching his huge cock bounce around in his underwear while he sat on the couch after dinner. I would sneak glances at him whenever I could, imagining what it would be like to suck his dick and get fucked by him.

One day when I was 18 years old, my dad's friend caught me staring at him while he changed clothes in the bedroom. He must have seen how turned on I was because he grabbed me by the arm and dragged me into the bathroom. He pushed me up against the sink and ripped off my shirt, exposing my tits to his hungry eyes.

"You're a fucking sexy little thing," he growled as he unbuttoned his pants and pulled out his big dick. "I've been wanting to fuck you for so long."

He grabbed me by the waist and lifted me up onto the sink, then pushed my legs apart and shoved his cock into my pussy. I felt his huge dick stretching me open as he pounded into me, making me moan with pleasure and pain at the same time.

"You like that, don't you?" he asked as he fucked me harder. "You want more, don't you?"

I nodded my head, unable to speak from the excitement and discomfort of having his huge cock in me. He kept pounding into me until he came inside me, shooting his load deep into my pussy. I could feel his hot cum oozing out of me as we both collapsed on the sink, breathless and satisfied.

From that day on, I became his regular fuck toy, always eager for his huge dick to fill me up. He would come over whenever he wanted, sometimes with his wife gone or without, and fuck me hard until he was done. Sometimes he even let me suck him off before we had sex, always making sure that I was satisfied as well.

I knew it wasn't right, having an affair with my dad's friend like this, but the thrill of being his secret slut made it all worthwhile. And besides, he never forced me into anything and always made sure I was comfortable with whatever we did together. In a way, he became my first true lover, the one who taught me what it meant to be truly fucked by a man.

And so, F, as a cum-swapping eighteen year old male, will continue to explore my dad's friend's huge cock and let him fill me up with his hot seed anytime he wants.