Define it? Well, I personally don't really mind Valentines day and I don't think I can. Just get her something simple? Something that says 'Thank you for the weird as hell date, I hope you have a wonderful day and yes, I'd like to spend it with you', flowers tend to do the trick. Chocolates never fail, hell even teddies do the job. I wouldn't say expensive jewelry yet, I mean you've only just met her? Nice costume jewelry?
This applies to you too Ren?