Apple Bloom loved it when Babs Seed visited.
She was her favorite cousin, and that's saying a lot because Apple Bloom has a lot of cousins.
So what they loved each other? So what if they liked to hug each other a lot and try to be in constant physical contact with each other? So what if they don't leave each others side when Babs visits? So what if they like to sleep in the same bed?
The other ponies see it, especially her family. Everypony sees it except for Babs Seed and Apple Bloom. They just look at it as cousinly affection. But what if it was something more?