I was going to ask this at some point but forgot about it.. I thought it be cool since Guri did unlock her demon form, if she could switch in and out between them. Guess thats a yes. But it be more fun if she did it willingly.
Also curious what that other demon plans to do. Its not like shes going to fuck up the other world, since Mavuro is suppose to be way more powerful than she is. She wouldnt take kindly the world she made for her daughter getting fucked up by another demon. But she would have to be up to something.