Fetters that are the ones doing the binding

So I've looked some stuff up and wanna see how you guys think this works or if it doesn't.

I'm starting a vtm game and there is a Hecata npc that I was going to have fully invested in controling Wraiths/raising dead. I looked around and did see that vampires can become wraiths after final death, and that Wraiths can have Fetters that are living people. Now putting it together for a very specific scenario: could said Hecata be a fetter for a past sire who is now a wraith? And could she bind him with Oblivion to work with her once again? I was having her be like a prodigal little sister of the Rossellini and her literally having her ancestor watching over her sounded interesting and her allowing him to possess her at times seems like a very creepy/intimidating thing (Kinda tangential but I'm thinking like in Sekiro >!where Isshin does the "poor grandchild" thing and takes over from him!< )

I have read through a good amount of the vtm books but I haven't read wraith so most of what I'm going off of is the vtm oblivion stuff and some things I searched online. It kinda makes me wish there was like a storyteller's guide similar to the monster manual where it gave in depth info on running other types of supernatural creatures as npcs rather than simple statblocks at the end of the core rulebook (so we don't have to deal with trying to balance stuff). If something like that exists let me know I'd def buy it.