Next, time to confess.
If you aren't head over heels in love with them, make sure to tell them that, but in a nice way, like "Just so you know, i'm not extremely into you, but i'd like to give love a try with you".
Adding stuff like your sexuality isn't a bad idea either.
-Slip a note somewhere only they will find it (personally, this is cliched but it might work)
-Just ask them out (Doesn't have to be a five star dinner, just ask it they would like to hang, maybe
grab some lunch at a cafe or something
-Or some crap like that (I highly recommend the second that one)