Is 'big little' play wrong?

This is a fetish I came across that just doesn't sit well with me. I'm not one to kink shame but pretending you are a little kid or pretending that your partner is a little kid and having sex with them leads me to believe that these people have darker desires. I know a lot of it is control and being submissive to someone but drinking out of bottles and role playing that someone is your dad and you have sex with them feels like more then a fetish that seems like a mental health problem / pedophilia. Anyone into this fetish have some insight?