Okay, it's my fault for this idea coming up in the first place.

: (Yes, I thought this exact thing the first time I saw "The Great Longneck Scheme" episode.)
I shall not deny that there is quite the possibility that Ret has a crush on Ali. The hints are few, but kinda obvious.
The first is a given. He's making up stories to impress Ali. Now, the thing is that he was only making up the stories to her and no one else, until he met Littlefoot and Cera. This is basically known by the fact that Ali was told these things before. It is a basic ploy that guys tend to use to impress the ladies, and in the case of being older, turn them on.
The second hint comes from him wanting to play the game "rescue" so much with just Ali. The thing is, he's always the hero and she's always the damsel in distress. Even with Ali giving other options of games to play, he still insists on playing a game where he saves her. It is the old thing where the hero and the damsel fall for eachother after the game is over. If it's set up to be more real and pull it off, the fantasy pairing at the end has a better chance of becoming real.
The final hint comes where he has to confess to Old One about making up the stories. The thing is, he was reluctant to tell the truth. That is, until Ali said, "It's okay, Ret." which gave him the confidence to tell the truth. To be given this kind of confidence, requires quite the heart. Since it takes "heart" to tell the truth when you've done something wrong, and Ali is what triggered it in Ret's heart, there is no doubt that she is in his heart.
Saying this, there is no doubt in my mind that Ret has feelings for Ali.
Yet, I question what he would do in a real sharptooth attack. After what I saw him do when Chomper pretended to attack, leaving Ali behind to defend for herself, I question it all.

Well, those are my thoughts at least. :^.^: