Benjamin Stockham, David Walton Benjamin Stockham, David Walton

Will (David Walton) and Sam (Adrianne Palicki) are (finally!) heating up on About a Boy, but leave it to his very friendly next-door neighbor Marcus (Benjamin Stockham) to crash their romantic breakfast.

In this exclusive sneak peek from Tuesday's new episode (9/8c, NBC), Marcus barges in on the pants-less couple mid-lip lock. But instead of giving the lovebirds some privacy, Marcus grabs a seat and starts talking about his birthday plans (or lack thereof). In a desperate attempt to get Marcus to scram, Will makes a big promise.

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Check out the exclusive sneak peek to find out what he says:

About a Boy airs Tuesdays at 9/8c on NBC. Catch up on the latest episode here.