Mystery Author, you apparently have much knowledge and experience with healing in its various forms, which I really found intriguing here. This is the most believable mpreg I have read (well, I am relatively new to fandom). I really like how you brought enough clinical detail to satisfy that part of me with bio-science education.
Also, the idea of Snape 'pushing magic into Harry' made me think of Reiki and other forms of hand-on healing that use the flow of energy in healing.
Also, the tragedy of Rhianna's death contrasting with the Snarry was original and wierd in a really good way.
I too noted some odd language uses, but most of it added to the quirkiness of the piece.