Dark Lord Wishfest

Over at darklord_news, there is a fic/art challenge - the Dark Lord Wishfest

ink_monkey wished for this: After a drunken one night stand (maybe after a party to celebrate finishing Hogwarts?), McGonagall tells Tom that she's pregnant. He has to marry her (to avoid a scandal, to avoid her enraged father, whatever reason), and finds his plans totally derailed by his resentful, shrewish bride. Set sometime after Hogwarts and before Hepzibah Smith's death. I'm envisioning this as a comedy, but any genre aside from tragedy or crackfic is fine.

Here is what I came up with!

( A Beneficial Arrangement )