Like everyone else, it seems, I do so love a possessive Severus... There is something interesting here though: Keith is married. Now, why wouldn't Harry mention that to Severus the first time the subject of the new co-worker comes up, I wonder... Especially if Severus does this "every time"? Maybe he loves a possessive Severus as well? Maybe he likes to drive him crazy with jealousy just because he can? Just saying... Lucky B-day girl!