LMAO... seriously giggly? I love it. That is how I get. At my age, I still cannot do something mischievous without the person knowing I'm up to no good. I immediately start giggling and laughing

When do those sly emotions kick in? Where are they?
Ummm, and I had a root canal when I cracked a tooth. I had the man numb that whole side of my head basically until I KNEW I would feel no pain. If I went to the dentist and had to have work done and they didn't numb me I think I would start swinging pretty fast.
He's got a reputation for being very tough since he also does a lot of painful things for fun, like boxing and extreme sports (most of which I've made him stop doing). And yeah, he'll giggle if you tempt him to be mischievous and he can't resist.
He never has the dentist numb him up for any work. No novocaine, lidocaine, nitrous oxide, or acetaminophen. The wisdom teeth extractions were the biggest things he's ever had done without any pain medication.
I wish I could have him have the baby instead of me. I'm a big ole wimp!
But back to the OP, it's okay if you don't learn exactly what she wants, but it would be really helpful if you could find out a scene or fantasy that pushes her buttons. Some women have a particular fantasy or two that has been featured over and over again while they masturbate. For women who have those deep desires for something in particular that they've dreamed about for years, having a man finally fulfill that fantasy is everything they ever dreamed of.
If she won't tell, or she's still too shy, or she isn't helpful guiding you, like submissivegirl83, I'm into wrist pinning. I also like having my wrists tied. Oh, and something TheBF did that no one else has done before, if she's wearing cotton panties, then if you hook a finger under the part that goes over her hip, right were the seam is, and pull, the panties will tear right at the seam, exposing her. TheBF pulled that one out on me once, and it really turned me on! It probably works on other panties, too, I just don't know that for sure. They aren't made to be tough, so I imagine most would tear fairly easily.
I also like it when he puts his mouth up to my ear so I can hear his breathe and his sounds while he fucks me, but that's one of my fetishes, I love men's voices, so that might not work for her. She might think that's creepy. I'm also not into having my ass slapped during sex, just before or after sex, and I don't like having my hair pulled during sex in doggy style. TheBF once pulled my hair from behind when we were both standing to expose my neck and then he bit into my neck passionately, and that was very effective. It was a different kind of hair pull though, not using my hair as leverage while he fucked me, just used my hair to expose my neck to bite it and send shivers down my spine. Again, I don't know if any of these things will work on your gf because we're all different and have different tastes.
For example, in my ravishment fantasies, they only ever happen in one of two positions, so I want to be taken in those two ways to fulfill those fantasies. I'm not a "against the wall" fantasizer like a lot of women (of course, that also could be because I'm short and it wouldn't work as well for me as it would for a taller woman), unless we're in the shower because there's lots of things for me to hold onto and I can prop my foot up in the soap dish. I like having my wrist pulled up and held behind me, but a hand on my throat freaks me out. Other women like the idea of a hand on their throat while they're being fucked. Doggy style turns me on, but some women don't like how impersonal that feels and prefer to be ravished missionary style.
There's so many possibilities for what she could want, I think it's a good idea to try and figure out what she fantasizes about!