What a wonderful story. Someone above used the term 'spikey edged prose' for your Severus and that just fits perfectly. he is spikey and sarcastic and grumpy and absolutely wonderful. I love your witty dialogue and clever little asides and I love the whole premise of how Severus got pregnant, just the sort of thing that might happen to him and Harry. *g*
I loved Severus' slovenliness and the way that he simply took over Harry's life and home, it was just so him. Loved where you ended it too, though I am now eager about a sequel.
Your writing style seems a little familiar, so even if this is your first snarry I am wondering if I have read you before? Can't wait to find out.
Also, this, "...muttering about how much better Eastenders would be with a dash of hexing to brighten things up..." it so would be!