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Just got out of raid and here me out for a second. The reason Ame is moving and where she's moving to have already been laid out weeks ago. The hints were always there, we just didn't think of it at the time because her streams have been so high quality lately. But if you stop and look at the clues, it's all there.
Firstly, let's start with her family vacation to "Wattropolis". Notice how this time she didn't mention Brother Watson staying behind to watch the beasts of burden. This implies he was with her and the rest of the family on vacation. Why would the entire family be together just for a family reunion?
Secondly, the family reunion itself. This is the first time Ame has been to it. This implies that despite it being a "big event", no one is beholden to attend. If that's the case, why would Brother Watson come this time, if he would normally be watching the animals? He wouldn't be reprimanded for staying behind, and judging by past vacations, he's been more than happy to stay behind anyway.
This all leads me to one conclusion. The truth is she's moving in with me. Sorry gays.