*huggles DD*
GOOD LUCK!!
Please though, try not to be sarcastic. Cause if she does like you and you're sarcastic about asking her out, she could take that to mean that you weren't sincere about asking her out.
And while I at least don't want a knight in shining armour (no offence, Silence), I'd probably say no if I thought a guy wasn't sincere when he asked me out. If you're nervous, that's okay. It's flattering to know that we can have that effect on you.