One of Martin's housemates gets pregnant unexpectedly. She and Martin are friends, so she goes to him for comfort/advice but before she has a chance to decide what she wants to do, one of the others accidentally lets slip she's preggers in front of one of her family.

They are not happy.

She panics and names Martin as the father.

Martin, freaks out a little but then steps up.

And to everyone's surprise, they end up making it work and are ridiculously happy, even after the truth comes out.