Wonderful story! I enjoyed it tremendously :) I love how you worked in Sabrina and how she wasn't Obliviated at the end. I've never liked the stories where Muggles always end up Obliviated. The romance and angst were just at the right levels too.
I would love to see if Harry's prediction about the baby becoming a wizard comes true. It'd be interesting seeing Severus/Harry and Sabrina and the baby interact together in a future fic. They are a fun group ^_^