His Favorite Place To Kiss You:
Harry: Your cheek. He'll come up with any excuse to kiss you and since making out in a corridor isn't a good idea he'll just randomly kiss your cheek.
Ron: Your nose. He thinks it's cute when you wrinkle your nose up after he kisses it.
Neville: Your cheek. He's a little shy about showing your relationship but if he feels the need to make someone back off he'll place a nice, sweet kiss on your cheek.
Seamus: He only kisses your cheeks when you blush, an inside joke about how he has a special talent for burning things.
Dean: Your lips. He says it makes him feel best when he kisses you full on.
Draco: Your temple. He can just casually put his arm around you and kiss your temple, giving you both a mood boost.
Fred and George: They both agree that kissing their ladies on the cheek is best.
