OMG, a muli-chapter fic! It's like Christmas in September!
I think that Severus' way of spending his birthday is so sad. He needs somebody to love, to argue, to dine, to laugh and cry, not just to sex, he is not an animal. So it is good that Harry has a plan. Or not. He usually doesn't have any. So maybe it's just good that Harry is good in getting what he wants.
I'm looking forward to next chapters!
Hugs,
myk