Scout
Everywhere. Jeremy doesn't have a particular place where he likes to kiss you. Jeremy loves every part of your body, so he'll kiss you all over the place. Every day Jeremy kisses you in a different place, forehead, cheek, neck, lips. Jeremy just kisses you where ever he feels like it.
Pyro
Cheek. Phoenix was very shy when you first started dating, it took a while for him to even kiss you in general. He eventually grew the courage to kiss you on the cheek. Even though Phoenix isn't shy to kiss you on the lips anymore, he still likes kissing your cheek more.
Medic
Jawline. Ludwig can be a bit of a prick sometimes and Ludwig kisses you on the jawline because he knows how much it drives you crazy. He knows he has you wrapped around his fingers when he kisses your jawline. Sometimes he just does it before a battle, just to leave you there all fucked up the entire battle.
Sniper
Forehead. Mundy is so much taller than you, so it's not a surprise that's where he kisses you the most. It's just easier for both you and Mundy for him to kiss you there, instead of him having to bend down or you having to be on your tippy-toes to kiss. As long as Mundy gets to kiss you, he's happy no matter what.
Spy
Neck. Jacques absolutely just loves kissing your neck, he can't help but kiss you there every time he gets the chance. Jacques knows where your sweet spot is and he never fails to miss it and get a soft moan out of you. You can just feel the curve of Jacques' lips against your neck, knowing he's proud that he has such a strong effect on you and your body.