Imagine the holy magic that they can do if they performed Serbian Lex...
The accursed and forbidden arts of the Balkan magicks; anything but that!
Seriously, though, I do think that mechanically it'd work like supercharging Nana's batteries, and that physical intimacy would be their solution. I mean, that was the buildup of the entire series.
Other than that, ayyy, a bit clumsy getting there, but happy about the confession.