DUDE! You are in a great situation right now! This is no problem!

There are no ways for you to be screwed here. You are not in any committed relationship, and neither are the two girls. Dating, flirting, even hooking up are all valid means by which to get closer to someone and see if they are the right person to spend the rest of your life with, or maybe just the right person to hook up with.

You have infinite options here, and none of them are immoral/risky except maybe raping and killing both of them.



EDIT- HOLY SHIT I JUST BURNED MY 4000th POST ON YOU!