I'd think the propensity would lean toward preferring a large cock regardless, with a nod to some mitigating circumstances.
If you start with that, and as many have said, well many females, you aren't going to hear many women talking about how they love larger cock to the exclusion of all else prior to the reveal.
Even so, preference doesn't equal obsession, which is the real butter on this bread. Starting with the first supposition, that there's an inkling for the enormous, a proclivity for the pronounced, and THEN you're the big swinging dick that turns her into your very own big-cock-stalker, congratulations.
Maybe.
I'd much rather deal with an expert experienced in the enormous - that way I won't get caught up in any clingyness so often present in new found obsession ... she knows there's plenty of Moby's in the sea.
(Yes, this was an exercise in alliteration)