I dunno man, when you're at a point of having good rapport, wait for a lull in the conversation and then say "actually I've just remembered there was something I forgot to give you" then lean in and kiss her!
Or if you're parked in the car and sitting side by side, wait till she's looking away and then gently pull her chin so she's looking towards you, hopefully she'll give you this look of anticipation, then go for it (if she looks at you like "what are you doing?" maybe don't).
Or...start a playfight with her, steal her book while she's trying to study and tell her she can't have it back, hold it out and get her to try and grab it off you, then hopefully she'll start trying to wrestle you for it, then you're suddenly holding each other at close proximity and it should just seem natural...
To be honest though, it doesn't matter how you do it as long as you do it. She knows you're a guy and that it's a possibility you'll try and make a move, so even if she isn't HOPING for it I doubt she'll be shocked...
Good luck man, get it done!
