has anyone else clocked that bilingual couples switching mid-play is kinda hot??

ok this is gonna sound weird. we're in manchester, both english, mid 30s, in the scene about 3 years. last weekend at a house party we ended up in a soft swap thing with a couple where she's spanish and he's argentinian and at some point during the night they just... slipped into spanish with each other. like proper full sentences. checking in i think, im not fluent, but the tone was clearly "you good?" "yeah you?". and i dont know what happened in my head but i was suddenly twice as into the whole thing. like it added this layer of... intimacy? between them that you could SEE but couldnt touch. and somehow that made it hotter not less. my wife said the same thing in the car after, "i loved that they had their own little channel going". is this a known thing in the LS or have we just stumbled on our own weird new kink. and would it be ok to like... actually tell a bilingual couple that we'd enjoy it if they kept their L1 going during play, or is that one of those things where its only hot when it's natural and asking for it makes it cringe instantly.