Lick their feet

Arya sits on a chair, she crossed her legs and she said "Worship my feet, show them love as you did with Cersei feet"

You took off her slipper and started kissing her foot, then you licked precisely every toe, one by one. When you finished, Arya gives you her other foot "You know what to do" she says excited "Keep going and don't stop until I tell you"