Examples
taunts 
"Hiya, Boobie Lady!"
"Hey there, Fun Bags!"
taunts 
"Hummina Hummina Hummina!"
taunts 
"You know, I think I could make you BIGGER!"
I assume Riot claims "we're too clean for that shit", but in some rare cases it could be comedy gold.
My 2 cents. No deletions, please.
You know, adult people do not talk like that.
"Is that a rocket in your pocket?"
"Sorry boys, I keep the fuzzy cuffs at home"
A lot of Ahri's lines
And as another commenter mentioned Xayah and Rakan pretty much take it
I am not against the idea, but it should fit the character:
Caitlyns "Sorry boys, I keep the fuzzy cuffs at home" is both pervy and fitting her sheriff theme.
Illaoi's "Northman. There are motions I would like to show you." is both a flirt and fits her deity of choice.
Considering the amount of examples listed your "at least one or two "pervy" Champion interactions" seems already fullfilled.
Super Galaxy 
and
and 
Pretty much every word out of 's mouth (at least before her VGU; can't speak for after, obv). Also
: "It's mating season~"
and 
are basically 'pervy champ interaction' incarnate
Nightbringer 
and Dawnbringer 
imply that they were lovers at one point (not that that makes much sense given how they supposedly came about, but it's still interesting)
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