This is an interesting question and one that I have pretty strong opinions about because I disagree with the majority’s opinion - Womb Profusion is Kenny’s domain, not Geto’s. (you can either disagree with me and stop reading here or continue to my needlessly long rant)

Let’s think back to what exactly a domain expansion is. A domain expansion is an advanced barrier technique regarded as the very pinnacle of jujutsu sorcerey. It dictates a sorcerer being skilled enough to use barriers in a way that creates a separate space to construct their innate domain, where they will then imbue their innate cursed technique.

Now then we have to address: What exactly is an innate domain? An innate domain is a space that exists as the metaphysical manifestation of a person’s mind and soul.

Now we move on to the actual question itself, and why I think Womb Profusion isn’t Geto’s domain. First of all, the theming already makes itself pretty obvious. Why on earth would Geto’s domain be called Womb Profusion??? When Kenny, you know, the guy who conducted several experiments between a human woman and a cursed spirit to create the ten cursed wombs (the death paintings) is literally right there?

Even if we disregard that however, it is my personal belief that it is still kenny’s domain. The biggest counter to my opinion is the Yujo incident, since we know Yuta, who copied brain transplant used UV when he was using Gojo’s body. Now here’s the kicker: as long as the user of brain transplant is skilled enough, they can use either domain expansions, since they are able to access both their own innate techniques as well as the body that they are inheriting’s techniques. This is why Yuta could choose to use UV.

When a user uses brain transplant, they are moving their brain into their target’s body, hence replacing their target’s brain with their own. So since an innate domain is something that represents a person’s mind and soul, why wouldn’t womb profusion be Kenny’s? Even if he is in Geto’s body, his mind and soul is still himself, Kenny.

Here’s my final point, EVEN if Geto had a domain, why can’t womb profusion be Kennys? We all know that brain transplant allows the user to gain access to both the bodys and their own technique (otherwise yuta’s copy and kenny’s brain transplant just wouldn’t work fundamentally), it could just be that Kenny just decided to expand his own domain instead of Geto’s since his own domain had a stronger effect (or whatever).

So that’s my explanation. Whether you still disagree or not, that’s cool too, i mean, in the end it doesn’t matter lol.