I'll throw in what I'd like to see in the future, as well:
-Tonks. At this point she needs way more content, given how shameless and unabashed she is with her sexuality. Because she has no limits, this also creates sooooo much potential for her. Not only could she do sexual favors for Genie or Snape, but for all other characters. Down the road I'd love to see an option where (if you get the other girls to a certain level of corruption), there will be sexual favors traded between Tonks and the other girls in Genie's office.
-More images (as someone else has said). I'd love to see an image of what the characters are describing when they return to Genie's office to deliver their "reports". Doesn't have to be for every single one... but one or two per update would enhance the replay value.
-Susan. Just a little something more with her, even if it's a few meager favors. Susan is relatively drama free, so between that and her big tits, it would just make more sense that Genie wouldn't waste her.
-Luna. She's on the right track, I just want to see where this goes...
Obviously I just listed a lot. That's my order of priorities, but above all else-- Tonks and more images to illustrate what happens outside of the office is paramount for me.