And then there came a mortgage

Well, the boy and the girl and their spoiled dog now needed a place to live. So they looked long and hard and found the perfect place for their dog. It had lots of room for sofas and toys and a huge garden for him to get muddy in.
So they bought it.
And now the boy works extra extra hard to pay off a mortgage and the girl works extra extra hard to pay off the dog food.
But what comes after all this? Well surely you must all remember the schoolyard song:

Mark and Pascale

Sitting in a tree

K-I-S-S-I-N-G

First comes love

Then comes marriage

Then comes Pascale with a BABY CARRIAGE!

So they decided to get one of those too...