When Lukas shoved him against the wall Mao anticipated some sort of physical blow. He was thinking that Luke was such a big jerk, not being able to take a few jokes. What a baby! Well, Mao planned to retaliate with a kick in the balls as soon as he was able. He didn't realize what was happening until he felt Lukas' lips pressed hard against his own.
Oh my fucking God! OhmyGodohmyGod! His brain flat lined, all proper function ceased. He froze for just a moment before his instinctual need to never be bested kicked in. His body moved on its own, fueled by the countless romantic scenes his muscles had memorized. There wasn't a movie or TV show around that didn't have a kissing scene in it at some point. He pushed forward, meeting the kiss with one of his own. Ahh...the wonders of alcohol!