Dean: He loves your legs. Whenever you wear shorts or a skirt, Dean will always pull you into his lap. He runs his hands over your calves and thighs while kissing you passionately or while you watch a movie together.
Sam: He loves your neck. He always sneaks up on you and plants a soft kiss on your neck, knowing it tickles you.
Castiel: He loves your hands. He always massages your knuckles with his thumb when you hold hands and then places a gentle kiss on them, smiling when you blush and look away.