Nice. A bit short on the surrounding story, as you go from main event to main event without much personal interaction, and that interaction is a big part of what makes for a good story, as opposed to PWP.
Otherwise, I like it. I'd like to see Gabrielle as one of his 7 bonded. Susan, on the other hand, does nothing for me. She's way too vanilla, and I have to have my extra toppings. Bellatrix, now she would be fun. The bond makes her loyal, but she's still nucking futs. She could be his dominatrix, and teach him how to really enjoy his slaves. Plus, she is extremely powerful, so that would help him. (Maybe that's the draw of Susan - she's powerful. Meek, but powerful.)
Speaking of slaves, if you are really stuck on Ginny as slave (I'd prefer to see her as a bonded), then make her a willing one. Maybe she figures out what he is doing because she still speaks Parsel from second year, and secretly longs for the security of having a master again.....