Michael and Holly have been dating for a week now and they are showing their feelings for each other through public displays of affection.  Nobody in the office enjoys seeing it so they tell the two love birds to stop.  Michael and Holly have a tough time at first but they end up okay after deciding to move into together.

Pam and Jim go out to a Valentine's Day lunch and get drunk.  They come back and search throughout the office for a place to consummate their love for each other.

Gabe sends Erin on a treasure hunt for his Valentine's gift to her.  She enlists Andy to help her with the clues and they hit it off in the process.