Very clever use of magic with the Patronus impregnation and how it works for wizards. I really loved the way Severus just took over Harry's life-moving in, very IC as he's both demanding and snarky as ever. And Harry as much as he suffers Severus's presence a bit, still absolutely wants the baby and for them to make a family together. I definitely look forward to a sequel if you write one but, having read this twice now, I can see why you chose this point to finish--perhaps the turning point in their relationship. Very nicely done.