Attraction to blind girls

Hi... I've been chewing on this for a long while now, and I really wanted to ask someone about it, but I have no idea to who I could talk about it, and to my surprise, google doesn't seem to come up with any answers, so yeah... this is probably the place I'm looking for.

Basically, it's been a pretty long while now that I have intense sexual fantasies about girls with certain disabilities. Mostly blindness (but sometimes also paralyzed legs... and sometimes even both).
And I really don't mean blindfolded or anything, that just doesn't do anything. I mean real blindness as in nonfunctional eyes, dark glasses, white cane.
And it sounds weird but I'm totally excited about the idea of having a blind girlfriend. I'd even accept the fact that it'd probably come with a great responsibility.

My questions are... how is this supposed to make sense? As far as I know, this is a complete contradiction against the human nature of finding the best partner to pass dna to and all that.
And is it supposed to be even a little normal? As I said, google results on this are very disappointing.
And could there be any reason, cause, explanation or whatever for this? I'm puzzled. I have this strong attraction and I have not a clue why.

So err... yeah, hopefully someone can bring some light into this...

Don't trust naïve evolutionary psychology; with conscious human beings attractions are not reducible to finding the best mate to pass on your genes. There is likely a range of unconscious factors and only introspection and—perhaps—psychoanalysis will allow you to discover the reasons you feel the way that you do and help change anything that causes problems.

Dichotomies like natural/unnatural and normal/abnormal are obstructive; I would suggest that you consider whether this significantly disrupts your life or makes you behave in ways you consider unethical.

Maybe you like the fact that theyd be kind of dependent on you and you feel that you would have less competition for their affections...

Or maybe youre hideously ugly

Im decent looking, but have a small penis, so blind girls are totally out