Awwww.... so, so sad. I was close to tears reading Severus being unable to touch his daughter and her lip quivering and his desire to kiss Harry even though he can't! That was really wonderfully done!
And the way you've spun it isn't totally despair. I really love that. Severus may be unable to touch his daughter or Harry, but he can watch them and be with them and interact with them. It also looks like Harry won't be planning to see anyone else, either, and that makes me happy. I think it would make me too sad if Harry didn't still love Severus.