Severus' overly touchiness has more to do with the fact that he was trying to reassure himself that Harry was all right.  It's got to be rather shocking that your child was only moments away from killing himself.  Also, I've established previously, that as a child who was denied love and affection for most of his life, Harry craves it.  I think most human beings crave physical touch, whether or not they realize it or are willing to admit it.  And Severus has grown to the point of unselfishness in regards to Harry that he can offer Harry what he needs.  And yes, since one of the people Harry loved most in the world has just died, I think Harry needed all the physical affection he can get.  Another thing to consider, is that Severus is well aware of just how easily such physical expressions of affection came to Sirius (at least my rendition of him), and it is quite plausible that Severus was unconsciously trying to fill that new void in Harry's life...  See the part in this chapter where Severus expresses silent delight that he has been able to fill one of Sirius' other roles--a person that Harry can talk to, to add to that plausibility.

I wanted to leave the recriminations there.  I am glad you liked it.  Guilt often comes with bereavemennt. 

And yes, snowdogs would likely be very therapeutic for all of them.  Thanks for your review.