This one was (originally a 3 sentence challenge) based on a prompt by 'prompt queen/demon' MyLadyDay, that said 'cheating on each other' (but I do what I want :P).
Masked Men
Ace was clothed in black, including a black hat, cape and mask and a sword to finish the outfit for the party he was attending. It was a pity Marco hadn't been able to come and see him like this, but there was a very interesting stranger dancing with him at the moment, clothed an old blue Spanish/Mexican soldier uniform and a matching mask and hat, actually matching pretty well with Ace's own outfit.
After a while of dancing in silence however, their faces drew closer and Ace's heart began to beat faster; he felt kinda attracted to this stranger, but he felt pretty guilty for it too, since he had Marco already.
Their lips almost met, when Ace pulled away, taking a deep breath. "I don't think my boyfriend would appreciate this."
The man in front of him placed his hand behind Ace's head and pressed their lips together nonetheless, finding little resistance from the freckled guy. After their kiss, he pulled away, chuckling and saying, "I think he does, yoi."