Excellent chapter! I love Hermione calling him "Pumbles" and feeding him chocolate ... Hermione and Severus holding hands in the tunnel ... Pumblechook discovering shepherd's pie ... so many wonderful details. Looking forward to more.
Finally he's starting to make good use of his Apparition opportunities. I really like what you have done with the idea of comparing fathers and sons. We've all seen the James-Harry comparison, but the one for Severus is an interesting new story line.
As always looking forward to more.