Sex with a co worker

I’ve worked with this guy for a little over a year now. We made out once a year ago after a weird night and never really spoke of it again until recently we’ve been talking and flirting and hinting that we want more to happen... the thing is if we do end up hooking up is that all he’s gonna want because I kind of have a romantic crush on him.. also I don’t wanna make it weird at work although we don’t work together TOO often

And I dont plan on staying here any longer than a year more at most lol. It’s also a really chill environment. I’m not really worried about making things weird if it ends badly. Just don’t know if I should hook up with him when it’s only like the third time we’ve hung out outside of work