Like Literally Jayvik. The Two Of Them Fused Together Steven Universe Style - Blog Posts

AU where Jayce brings Viktor to the hexcore as in the show, but instead of fusing it with Viktor, the hexcore demands a human sacrifice to bring Viktor back - a life for a life. Not wanting to sacrifice someone else, Jayce offers himself, and so the hexcore fuses Jayce's body with Viktor's to repair his body, creating a person I'm currently calling Vyce.

(Viktor and Jayce can still talk in a mind/dreamscape type of place similar to how vik and sky were doing it in s2, though)