kutrigur (bulgar's older brother) and young bulgar are arguing.

kutrigur: if u don't stop talking about yogurt to people, u'll never have friends!

bulgar: well so be it then! I don't need friends if I gotta pretend to be someone I'm not for them to be my friends! I'm gonna have real friends who accept me for who I am!

kutrigur: dont u get it! we're supposed to have friends! friends are useful! they're our allies! u can't always beat everyone up! one day, there will be someone stronger than u and u won't have anyone to support you in fighting them! but u've never thought about this! ur just a spoiled kid, u were dad's favourite kid and now it shows!

bulgar: SHUT THE FK UP KUTRIGUR *punches kutrigur in the solar plexus and flees before kutrigur, now stumbling and gasping for air, can retaliate*

later

young bulgar meets young avar for the 1st time ever and they start talking

bulgar: I like yogurt : ) IT'S THE BEST

avar: YOGURT IS THE GREATEST THING EVER YOGURT IS THE SUPREME FOOD THE KHAGAN OF FOOD THE DIVINE GIFT OF TENGRI WHEN I EAT YOGURT I MAKE SURE TO EAT IT ALL AND NOT LEAVE ANY OR NOT LET ANY DROP

and so it was clear that the 2 were bound to become best friends, they probably even became sworn brothers.

lol I can imagine bulgar rubbing his friendship with avar in his brothers' faces like SUCK IT LOSERS I'VE NEVER LIKED U I LIKE AVAR MORE THAN I LIKE U SWORN BROTHERS ARE BETTER THAN BLOOD BROTHERS CUZ U CAN CHOOSE THEM AND THEY'RE AWESOME

(kutrigur and utigur were probably too busy fighting each other due to byzantine's intrigues to pay any attention to him)

(later, it bit him in the ass cuz avar tried to tell him what to do and treated him as inferior, they fought each other, there was a war between them and they never talked to each other afterwards)