da thats why you just use their names or avoid altogether imo

"Chanyeol looks over at Baekhyun, taking his hand. Baekhyun's fingers are long and slender, perfect to fuck Chanyeol's ass with."

is way better than

"Chanyeol looks over at Baekhyun, taking the smaller's hand in his big hand. The smoll one's fingers are long and slender, perfect to fuck the taller's ass with."

ps im clearly not a writer