And we ain't just playing.
Showrunners/producers of both shows were the ones who got this ball rolling in the first place, after PLL's I. Marlene King tweeted TVD's Julie Plec the following:
"Hey @julieplec, I feel like we are always 2 
(ships) passing in the night. Wanna grab a 
(coffee) and talk about making a
(television show)?"
DON'T PLAY WITH US LIKE THAT UNLESS YOU'RE BEING 4 REALS.
Make it happen.
