Kit Connor Kisses 'Warfare' Costar Charles Melton During Promo Trail

Kit Connor is doing everything but taking his kit off -- he’s turning up the heat by locking lips with some of his "Warfare" costars during the film's press run!

Now, the movie’s clearly all about war and action, but Kit was in the mood for a different kind of combat -- puckering up with Charles Melton in a clip that’s got fans buzzing.

Looks like the "Heartstopper" star built some solid battle bonds on set -- 'cause it was actually Charles, who's assumed to be straight but hasn’t confirmed, making the first move and swooping in for a quick peck with Kit.

Kit was all about spreading the love ... another clip shows him cozying up to Taylor John Smith, planting a kiss on the camera before sneaking one onto Taylor’s cheek.

It wasn’t just smooches -- Kit was getting a little handsy too. In another clip he reached back, seemingly aiming for Joseph Quinn’s hand, but instead, his hand landed somewhere a little more intimate ... leaving the "Stranger Things" star looking pretty startled.