Now, I have a little personal going on. A fan fiction regarding a character I RP quite often. That character is my Necromancer, Weylin Hearthton. Now, a while back, his wife, Shezra, was killed during a raid upon their compound by one of the Templar Orders located in Hammerfell. Shezra is near death, so in a desperate attempt to keep her alive, Weylin binds her soul to him, planning to revive her at a later date. I pictured that the binding would allow Weylin to summon her spirit, and when Shezra's spirit would be within him. I've toyed with the idea that the two could still communicate, and that Shezra could insert thoughts into Weylin's mind.

However, I am unsure of how lore friendly this would be. Hellmouth suggest that I have Shezra bound to a modified Soul Gem that keep's the Soul inside, instead of "keeping it svcked in" and allows the Soul to be called out when needed. Daroska suggested that Weylin to turn her into a Wisp, through a process he thought out.

"1. Capture Shezra's soul in a soul gem
2. Enchant the soul gem with wind resistance (sort of an anti-fire destruction) and magicka resistance
3. The last step has to be really powerful, which is only why I'd imagine the most devious of demiliches to perform it
4. Once the pact has been made at this point, take the soul gem to a certain launch point and drop it
5. If the soul gem smashes, the soul is released in a statistically same-shaped prison, allowing the soul to move freely about the world in pure spirit.. if having to push it's boundaries in order to move anywhere."

He was basing this off of the fractured, crystal like look of the Wisps that Wispmothers and Anomalies formed from the Eye of Magnus. Now as much as I like Daroska's theory, and Hellmouth's "Bound to an item" idea, but I'm still tempted to go with the Soul Binding idea. But I am worried about the possibility of one soul overtaking the other, or even worse, the souls melding together.

So: Would it be lore friendly for Weylin to bind Shezra's soul to him, being able to summon at times, and keeping her soul in him when she is not summoned?

Thank you in advance.

Well, Skyrim gives us three different variants on this that you can roll with if you aren't satisfied with Daroska or Hellmouth's ideas, and Oblivion gives us one, kind of.

The first is Lucien Lachance. We don't know exactly what happened to his soul after he died, but it's my belief that he went to Mephala's realm, and the Summon Spectral Assassin spell is, in fact, calling him from there. So maybe Weylin makes a pact with Clavicus Vile as Shezra is dying so that her soul ends up in his realm, and he gets a spell to summon her indefinitely? Lachance is probably the closest thing we've seen in-game to what you're describing.

In the same vein is Arvak in Dawnguard. Again, you cast a spell which summons him from the realm in which his soul resides, in this case the Soul Cairn. So you could have Weylin soul trap her in a black soul gem,

The third is Arniel Gane of the College of Winterhold. I don't know how well this would apply to you, though, given that I doubt Weylin has Keening or a warped soul gem lying about.

Aside from that, the only other instance of a soul being bound to another person that I'm aware of is the http://www.uesp.net/wiki/Oblivion:Lich_of_Lost_Boy_Cavern, who upon the death of his body, bound himself to his slayer and took over his mind. But he could only do that because he was already a lich, and his soul was bound into a phylactery, a process which we know from the case of Celedaen to take several weeks. So I don't know how much help that'll be to you either.

Hopefully something in all that gives you an idea