Most Helpful Guy
Yes you should ask him out, becuz y the hell not xD
as far as what words to say I don't have shit... I'm in a relationship now, but my knowledge on getting a girl is still strictly at a friends with benefits level.
Most Helpful Girl
Don't do it. You need every single voice at that company. What if they want to hire on another full time position? He won't be able to speak for you because of romantic issues. What if you want to use him as a reference down the road? You won't be able to because you were otherwise involved.
Go out as friends if you really want to but that's it.