It's wrong to sleep with a co-workers partner.
Jake is out having dinner with Sally, who is his co-workers girlfriend.
Jake wants to have a good time.
Jake and Sally share some funny stories about Jake's coworker.
Jake and Sally have a few drinks, and he ends up taking her home with him.
Jake and Sally become platonic friends and have many more enjoyable dinners.
Jake feels guilty when his coworker finds out and hates his guts for what he did.