Scott: Your forehead. Scott loves the blush that spreads across your face every time he'd do it.
Stiles: Your nose. Stiles loves the way your face crinkles and the glare you shoot him afterwards.
Derek: Your lips. Derek loved how you'd immediately kiss him back.
Isaac: Your hand. You would always giggle and blush, then hug him tight afterwards.
Alison: Your cheek. You would grin so widely afterwards, making Alison blush a light pink.
Lydia: Your neck. Lydia loved the mark her lipstick would make, claiming you as hers.