Pretty much daily, maybe twice.
I usually think of her taking my own huge cock, and I listen to sound recordings of us fucking when I want to stay really hard in my pump. Her moans and screams really do it for me more than anything else.
But probably 2-3x a week, I think of her fucking the monster cock she got in college. A lot of times, I'm not even thinking of the actual fucking, but more like imagining the possible scenarios where she first saw his size - she hasn't told me details about the first time reveal, so my mind runs wild. I guess I just like picturing her in shock, since I never really got that reaction from her because she was the only woman I ever fucked who had been with someone bigger than me.
I picture her, a busty petite girl who just got to college, being intrigued by his reputation. Maybe she watched him from a distance at a party and whispered with other girls about how big it could actually be. Maybe she placed a bet with him about his size and lost when he proved he really was as big as they said (which was really a win, since she loves massive cocks). Maybe she was uncharacteristically forward and just straight-up told her friend "I want to try your huge cock." Maybe this followed her seeing the outline of his monster in a Halloween costume he wore to show it off.
Or maybe she didn't even know about his reputation yet. Maybe he just hit on her and it was a romantic build-up to a reveal, when she ran her hands down his body and felt a massive arm-sized bulge formed in his pants. Which, I assume, would have led to her asking if it was real, or looking up into his eyes with the most lustful look she's ever given. Or maybe she pulled down his pants and was hit in the face with his rock hard 10 inches, said she was scared, and he had to calm her and tell her he'd be gentle. But from her descriptions, I doubt he was gentle; I wonder sometimes if he was into race play (even though I've never really been, I think he may have been because she was kind of under the impression that black men like him are all uniquely huge...I broke her of that impression years after him). Maybe he basically walked right up to her and told her he wanted to stretch out her tight white pussy with his big black cock. Or flashed his bulge to her to get her attention. Maybe he took notice of her gorgeous big tits and told her he could titfuck her while she sucked him - I mean, that's a party trick I've used to impress women, so why not him?
Or maybe she was trying to get back at an ex boyfriend who cheated, so she fucked the guy who was known to be huge. Maybe she did it during a party so people would hear. Maybe there were pictures or a video of her hands, mouth, or pussy wrapped around his monster. Maybe she doesn't talk about the first time because she was regarded as a slut by those who heard, and it brings up bad memories...or maybe it was entirely private, but she was the one cheating on another guy. Maybe she fucked him at the urging of another guy, like she was cucking her boyfriend with this huge black cock.
There are just so many possibilities here, it's given me hours of entertainment!