Adam and Mary, two gay siblings, decide to bring their partners home for Christmas dinner. They really don't want to come out though, so they come up with a plan; they'll swap partners and pretend to be two straight couples. After a tragic first encounter with Grandma, who has a lot of opinions about children out of wedlock, foreigners and - bread, Steve can't take it anymore and threatens to leave. Adam has his way of persuading him, but that may involve the two of them, a tiny cupboard under the stairs, and a very high chance of Grandma walking in.