Will Hinata ask Naruto to put his slave seal on her? It would fit with your Hinata and her...worship of Naruto to be made his Doll/Slave/Servant.
Will naruto marry in this? For girls who are close to him and have to marry (Hinata, Hana [close by force], and Ino) will he still sleep with them afterwards? Will the girls have him put slave seals on their husbands? From what we have seen, the seal could be used to force a psychological and/or memory change; making them submissive to their wives in private and loyal to Naruto and completely okay with Naruto sleeping with their wives without being able to tell anyone directly or indirectly about the situation. A way to continue things with far less danger.
Hinata helping out with Moegi's and Hanabi's sex ed would be a nice touch. They have no knowledge/experience with lesbian/yuri sex after all and Mebuki would have difficulties meeting them for such activities but Moegi can be called a friend of Hanabi and Hinata is her older sister so them being together is not that farfetched especially if Ino or Sakura join in to make it look like a girls night or something of that nature.
Did anyone hear Moegi when she mentioned to Naruto that he cannot finish inside Hanabi?
Hope some of these ideas help!
PS: agreed with malefix on Hanabi being a entertaining read. Please continue to use her. Will we see moegi's first anal? have a feeling hinata will ask for it so that she is completely claimed by Naruto lol