This Gift I Give to You: Summoning the Ghost

My name's Jace. My girlfriend recently had to kill her own brother. Granted, he was a demonic megalomaniac, obsessed with her and with ruling world, but still. The point is, she mourns him. It pains me to see her hurt. What if, there is a non-demonic version of him, from another AU I can find and bring back to her, should I? Would you? *Warnings: Smut, Gay/Bi/Poly, Language, etc.!*