The kiss is the same as the one they did the last time, but this time, it's a little different. It's not so much the push that's the problem, but the "flow" of the kiss, which makes it hard for Akio to catch his breath. Akio's worried that he's going to get wet, so he whispers to himself that he didn't realize he had someone else do the kiss for him. He doesn't want to be the one to do it for her, but he does want to make sure she's okay.