Consider: Genji gets so angry, he actually vibrates a bit. Zenyatta finds Genji after he and Hanzo had an argument--brothers, you know??--and he reaches out to the vibrating boyfriend. Genji is just so angry he's ranting on and off in Japanese but all it takes is a small laugh from Zenyatta and massaging on his back to make Genji purr instead. And he melts like putty and relaxes against Zenyatta.
he VIBRATES that adorable…. also i fucking. love the idea of genji making purring sounds like thats fucking adorable… i love it…. thank u anon