Ok, but autistic!Tango who doesn't understand a literal thing that everyone assumes is Common Knowledge, and probably is honestly, and he can tell that he doesn't Get It, but that it's Common Knowledge, and now he's suddenly afraid to ask a question, because he did the same thing in middle school and was bullied from then on all the way through high school, until coming to Samwell, and it's why he went to a college Far Away from home.
Lardo notices his small frown, the pinch in his eyebrows.
She waits until there's a moment with just them and looks at him and goes "It's a pop culture reference. From (Insert pop culture show/movie/book)."
Tango's lip wibbles, but he doesn't cry, and his eyes stay dry, but his voice cracks when he quietly says "Thank you."
Lardo shrugs, says no problem, but asks him why he didn't ask.
He admits he didn't get a reference to Captain America, of all things, in middle school, and got bullied until he moved to go to Samwell.
Lardo tells him to not ever worry about that: if the boys' chirping makes him feel bad, she'll handle it. He just needs to ask.
Tango asks Lardo things he genuinely doesn't get but knows is probably "common knowledge" for the rest of the year.
She answers everything, and if she somehow also doesn't know, she tells him, and they ask Ransom, who usually always knows.
But she also notices that Tango is smart, and is a pretty decent artist himself, and what is that very detailed bug you drew holy shit??
And Tango proceeds to infodump on her about this bug because he's been obsessed with not just that one, but all bugs, since he was 4.
And that's how Lardo learns her frog is a Biology Major and wants to study bugs.
And then whenever Tango asks her something, a bit worried he's being dumb about whatever he's asking, Lardo asks a question about a bug. Any bug. She asked about caterpillars and Tango got so excited and talked to her about it for almost an hour before Holster came downstairs, heard, and went "what the fuck, gross."
Lardo shouted "You're gross, asshole! This is fucking cool!"
She tells Foxtrot there's a mandatory "ask Tango about a bug at least twice a week" clause to her new job, and Foxtrot goes "weird but ok".
The first time Foxtrot does it sophomore year, Tango gets so excited that he nearly knocks her down.