>>150198437
Dunno what the driving force in your attraction is but for me part of the appeal (at least for the TF stuff) is how the sunny persona shifts their own behavior. There is something very appealing about one very strong emotion dominating their outlook, coloring their core personality and expressing it through this one very powerful lens.
In this case it's a happy bimbo like "sunny" personality trait overtaking them. A giggling smiling joyful version of themselves. The look by itself is nice, but what really turns this into an attraction is that mental aspect.