I read a truly nsfw tale a few years ago. I like it because of the concept, not the explicitness of it -- not that I have a problem with that kind of literature.

I looked all over FM for it, trying the various filters. I couldn't find it. Oh well.

Anyhow, it's about a kind of loner type IT person who gets befriended by a group of you standard beer-guzzling sport-watching types.

They plan a trip to the cottage of one of them. They are all going to do the fishing and beer guzzling thing. The thing is, there is going to be a girl there who will provide the <ahem> entertainment.

The story is that he has to wear this amulet that he has to technically win in a game of poker. He spends all week thinking about the girl that will be entertaining everyone. He is told that he'll get to take the girl home after the vacation. Technically true, if you know what I mean.

You guessed it. He transforms. He can go back to his old boring male self by taking the amulet off before it becomes permanent.

There are actually two stories. In one, the new girl loves her new life as a super bimbo and goes home with one of the brothers.

In the second, the protagonist decides that he doesn't want to take home a brainless bimbo. He imagines a high-born elf that was cursed with enhanced libido, but who retains her pride.

And interesting things happen...

Any ideas?