Searching for...flat chested woman of mystery on spring break

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Thank you for reading this. I'm looking for a specific story that had a high rating, but I can't seem to find it. Here's what I remember:

Young college student goes to a party on spring break. While ogling a big breasted woman, a flat chested woman seduces him in a closet. She vanishes, he finds her, they get together.

Details:

The female character gives a false name initially.
Both primary characters are on the East Coast.
Both have money.
The female character was well written and very funny.

I'm trying to send this link to a friend. Any help I can get would be appreciated.

Thank you!