Lindsay's request
Justin goes to put on some pants for their uninvited guests. Meanwhile, Linds asks heterophobic Brian for a favor...pretend to be a happy married couple with her to get Gus into an exclusive preschool. (Even if Brian didn't do it, couldn't they have asked one of the other guys? It's not like he's the only one they know.)
M: Whenever we ask him to do something, he systematically turns us down.
To be fair to her, Brian has turned them down before for sure, but hasn't he agreed to father Gus, signed over his parental rights to her in order to reunite their family, offered money whenever they've needed it to take care of Gus...? Kind of unfair, Mel.
And of course, he agrees to this too, for Gus's benefit. He'd even pretend to be straight for homo-haters for his son.