James: Your eyes-
James has a real thing for your y/e/c eyes. He could get lost in them all day. James had memorised your eyes and adores the way they soften when you see him.

Sirius: Your lips-
It's not just because he loves attacking them with kisses, Sirius loves your lips because he loves watching them as you talk, when you stick up for yourself or others or whether you be talking about a prank or biting your lip, (which turns him on).

Remus: Your hands-
Remus loved the feel and look of your hands. He loves tracing your veins and interlacing your hands. Remus makes you blush - even if you don't admit it - when he kisses your fingertips and rubs his thumb over your knuckles.