Autistic Shane has echolalia which is why he likes to randomly switch to a Russian accent and repeat back all the little Russian phrases and accented words Ilya says. At first, Ilya thinks he’s making fun of him like some weird form of chirping, but he eventually realizes Shane is just Like That TM (being his cutie patootie self.)
Shane: *sounds progressively more Russian during a conversation*
Ilya, thinking Shane’s making fun of him: that fucking asshole?
Shane, whispering in a perfect Russian accent: ✨neveroyatnyy✨
Ilya, clearly wasn’t supposed to hear that: ????!!
Ilya drops several Russian curses while they fuck once, and Shane just moans them right back. (Maybe Ilya fucks Shane three ways to Sunday afterward, and maybe he starts speaking Russian more during sex, but that is NO ONE’S business!)
Shane speaking to JJ during warm-ups: *unconsciously copying his accent*
Ilya, eavesdropping: No, that’s our thing >:(
Shane has genuine difficulty staying quiet and not echoing when Ilya gives his monologue over the phone, but he thinks it would upset Ilya if he did. (And Ilya will never admit it, but each time he said “I love you” in Russian, he hoped Shane would say it back in his little echo, even if he knew Shane didn’t mean it. (He would.))
Shane in the hospital, high as a kite, in a Russian accent: bye bye :)
Ilya, heart eyes 15000%: fuck this, fuck you, nurse I am having heart attack
This is also why Ilya believes Shane could learn Russian in two weeks because SOMEHOW (with his echolalia) Shane is really good at replicating the proper pronunciation.