Now, the pairings I see for this:
I only see one couple doing this and that's my Tokyo Ghoul ocs.

Kisa Onaga x Nissho Sato
Kisa always seems to have that "kill me now" aura around her but it goes away a little whenever Nissho I'd around, only a little, like a tiny pinch. But Kisa does enjoy the affection her human lover gives and Nissho loves his cold Ghoul girlfriend, although they....well Kisa isnt fond of PDA but Nissho knows the amount of love she has for him is bigger than the amount of people she has eaten.

And even if they don't kiss or hold hands in public, Nissho ask questions like the scenario above to prove their love for each other.