Be honest with yourself [if not with me, lol], Vicky. If you liked guys with 9" cocks and you knew your fantasy guy had a 3" cock, you would fantasize about him with that 9" cock. That's the whole point of a fantasy, we imagine things the way we want them to be, and each of us is allowed to fantasize any way we want.
Just like me fantasizing about Paris Hilton with bigger breasts. ;-)