This is a very good story. It really has two parts.
The first part builds the case for a sexy threesome for Valentine's Day. The author does that part about as well as I've seen it done.
But then the author throws in a really interesting twist. That twist makes the story much more complex. To be honest, I don't think the author works out all the intricacies of this twist, but that's because the ideas are quite complex - if you think about them - and this story DID make me think.
If you haven't already read this story, I urge you to check it out.