What is going on with pairing Lex Luthor and Rouge the Bat?

I keep seeing things on social media about Rouge and Lex Luthor. Sometimes romantically involved? (Gonna assume that's fans getting carried away) but it seems to have something to do with a crossover between DC and Sonic series?

An example: [https://static.wikia.nocookie.net/801e6b33-b9c0-469a-89cc-b9558bb44504/scale-to-width/755](https://static.wikia.nocookie.net/801e6b33-b9c0-469a-89cc-b9558bb44504/scale-to-width/755)