Well yeah, there's always shades of grey when it comes to orientation. Or really ANY facet of human existence. There is simply way too many unique personalities and way too many factors for their to be a strict 100% certainty.
From what my friend explained to me about my post, after I posted this. You can be both Demisexual and another orientation. Demisexual just means that you don't get sexually attracted to someone unless you have romantic ties to them. So one can say, be both Demisexual and Straight. Demisexual just a middle ground between sexual and asexual. It doesn't have anything to do with monogamy though. Someone can be demisexual, bisexual, and polyamorous at the same time.
So in my case, I guess the proper thing for me to say is. I'm Panromantic, which means I can get romantically and emotionally invested in anyone, gender doesn't matter, and I'm also Demisexual.