Over time you'll probably come to realise but, nerds, geeks, cheerleaders, jocks, spazzes or goths are all pretty similar when it comes to this kind of thing. Sex. Every human loves to f**k (excuse my language) because we're programmed that way. Often times in fact the nerds or "quiet ones" are into the craziest stuff "in bed". I think you're over-thinking it. You don't need to be as shy as you think you do. In fact I'd beg $100 if you straight up bring it up with her honestly and loudly, she'll be impressed with your honesty and forwardness...not to mention more than a little turned on
Can't wait to hear how this one pans out.