Traditionally, it's the men who confess the love for a woman who feels the same way. So I think that Ace will be the first one to confess his feelings for Lexi. However...there are exceptions when it comes to confessing romantic feelings to someone. One example is if the guy takes a long time to make the first move. If the man takes ages to make that first move, then the woman is free to make the first move. If Ace is too stupid to act on it, Lexi is free to make that first move. Either way, it could be any of them.