Harry: He loves it when you play with his curls. It's not even a noticed action, your fingers will just start doing it, calming him down and making him smile.
Liam: He loves it when you stick out your tongue slightly when you're concentrating. You can't help it, but he thinks it's adorable.
Niall: He loves it when you mumble in your sleep. Sometimes it'll be about him and he'll sit up and listen, looking at you with admiration and true love.
Zayn: He loves it when you play with your fingers when you're nervous. They'll fiddle around until he puts a comforting hand over them in reassurance.
Louis: He loves it when you'll laugh at his jokes even when they're the cheesiest ones. He likes knowing he can always make you smile.