Search Results: third wheel

So a little while ago, my roommate proposed to his girlfriend, and she said yes. My roommate was saying that he wanted to get married once he pulled enough money together. His "timeframe" basically made it so it'd be a month before our lease expired.

He said he wanted his fiance, after marriage, to live with him once they got married. He basically pitched it as, "We know we can't live completely liberal around you like a typical married couple, but we want to live together."

He asked my thoughts about it, and I'd say I'd get back to him.

I'm hesitant about it. The fiance is a cool person, and I've had no problem with her, but the idea of a third person in our spot is kind of unpleasant space wise. Likewise, I'm worried it may get awkward, like living as the permanent "third wheel." On the other hand I'm like, "pssh, it's only like a month. What could go wrong?" My roommate is a good friend of mine, and I'd rather not lose him from whatever happens.

So what are your thoughts? Think it sounds like a bad idea in the making, or no?