Ah, poor Harry, Dumbles has given him yet another rum deal yet he's trying to make the best of it for them and for him. I can see this having some very interesting consequences as the five of them form into a most formidible team and Albus finds that he's created a "monster" he can no longer control and Tom finds that "the power he knows not" is the backup these four witches provide. Somehow I don't think any of the other factions, Tommy & his Deeze, the Ministry, and Dumbles and his minions willl be able to stand against them.
I was amused to see Hermione shot down so quickly in her crusading righteousness; if she can learn from this, she'll be a better and more tolerant person all around. if she can, weell, Harry's probably better off without her influence, no matter how it feels to lose a long-term friend.
I'm going to be very interested in where you take this; especially as the feelings 'tween Harry and "his" witches seem to be modifying and growing with time.