Oh, I loved this! So delicious, all of it: the interaction and banter between Harry and Severus, their hot and fumbling sex, Harry as a wandmaker (I think I've just discovered a new kink of my own *coughs*), the effect the wand had on Severus once he received it... so visceral and tingly. Awesome.
This was my favorite line:
“Believe me, Potter, I would never call anyone a Slytherin as an insult.” Snape smirked. “Now if I call someone a Gryffindor--”