It's already happened

There was a famous case some time ago where a single man adopted a girl from Russia - he started a sexual relationship and eventually got busted, apparently that one case led Russia to tightening down adoptions - among other reasons.

I don't really get your reasoning - in your other post you state that your attraction makes it more difficult for you to say "no" and so forth (I'm guessing that's what you mean by "effect the adult role you should have"), but it seems you assume this would work the same way for other people - and that it's bad.

>>It is not a healthy relationship in my view, that is all. Being authority to your love interest is not what I can call healthy.

Maybe you just can't achieve a good balance? You say it's unhealthy but haven't really presented an argument - similar to antis saying relationships between adults and children are unhealthy without presenting an argument.