Luke: Your personality. You have the best since of humor and you actually laugh at his corny jokes. But you know when to be serious. You are kind and generous. If you see anyone that needs anything, you give it to them instantly.
Calum: Your hair. He loves to play with it. He constantly twirls it while you're cuddling or at an award show, etc. He loves the feel of the nice silky texture.
Ashton: Your hands. Your hands are so much tinier than his. He likes the way your hands look intertwined with his. He says it looks like his hands are eating yours. He also likes the way they feel, nice and smooth.
Michael: Your smile/lips. He loves making you smile because it is the most beautiful smile he has ever seen. You have the whitest and straightest teeth he has ever seen. He loves kissing your lips. The nice feeling of them makes him happy.