Get to the Point
Actually, I think it is possible to predict given what we know so far. Here's my attempt: Now that Ao Yi is there, Changshou can only rope him in somehow. He can't kill him for the same reason he spared him the previous time, he can't incapacitate him and alter his memory either since he has a huge entourage, so he can only acquire his help in keeping his secret. If he gets exposed, he's screwed since it infringes upon the benefits of the Western Sect. He could simply tell the truth and ask Ao Yi for help in destroying the sea god sect, but Changshou would probably not want to ask for a favor, since he would owe significant karma in that case, and there's still the possibility of being exposed since Ao Yi doesn't really have any stake in keeping the secret and no reason to make a vow to the Heavenly Dao. Asking that would only make the karmic debt heavier. So instead of receiving a favor, he'll have to find a way to make it seem like he's actually doing Ao Yi a favor instead, reversing the karmic debt. The poor dragon's gonna get scammed for sure, but knowing Changshou, he wouldn't want to leave any resentment behind, so it'll probably be beneficial to either Ao Yi personally or to the dragon race. Simply dissolving the Sea God sect isn't enough benefit for Ao Yi, so he'll probably have to keep it going and instead let him share in the benefits. I doubt he can simply hand over the position of Sea God to Ao Yi, since if that was a possible solution, he would have already done so. But maybe there's a way to let Ao Yi or the dragon race as a whole receive some merit and use them as a shield against the Western Sect? That still leaves some hidden danger behind, but the western sect probably wouldn't move against the dragons over a local sea god. It's the best solution I can come up with.