I AM THOU, THOU ART I
FROM THE SEA OF THY SOUL I EMERGE
MY POWER IS YOURS, NOW STOP CASTING MARIN KARIN ON RIKO
YOU ALREADY CHARMED HER WITHOUT ME, GIVE THE POOR GIRL A BREAK.
Well, D.va has a cat skin, and her robot has jets. This basically makes her Jetpack Cat, so it makes sense that Brigitte would want to pet her! (It is canon that Jetpack Cat is hers/torbjorn's, right?)