Looking at the comments, it feels like we read a completely different manga. That, or people are just grasping for straws/relying very heavily on their imaginations
The cover also doesn't seem to match up with the characters in the story at all
Like, seriously though. Just read it, and I thought the whole point is that they're close like their fathers are to each-other. Like brothers, and best friends.
Are they not allowed to miss each-other as they move away?
Exactly. People see what they want to see, but on the face of it, this is just a story about cousins who are sad that they'll have to be apart
The only reason this could even be considered shounen ai is because the author is a BL mangaka. You can hold hands with your cousin without it being romantic. It's a pretty familial thing to do, especially if you used to do it as kids and are doing it now for old time's sake