With the girl I've been speaking with for 2 months, I made out with her twice at the very start of things and when I see her now(get the train to work) what I do is flirt hard and use alot of sexual innuendo which usually gets her giggling and I have my hand around her shoulder and stroke her there. Basic kino....

Sometimes she gets in funny moods and is throws out the bitch shield and is all like "don't touch me I'm hot etc" I stop for a period of time and try again. I touched her back lightly when we were walking and moved my hand near her ass but quickly moved it away because of the mood she was in.

I probably won't see her for a week or two and will try this again but when will I know it's okay to grab her ass? I want her to know that I'm not scared and I can back up the dirty confident talk.

Grabbing ass is pretty much foreplay, it only serves to get you hot, therefore you shouldn't do it in a place where it can't realistically lead to sex. It will just make her uncomfortable. The urge to grab is often overwhelming, I know (I'm a big lover of butts as well) but stay strong and only do it in privacy. You'll probably encounter less (if any) resistance.

I would refer to Gambler's methods in this case.

If you may be sitting down with her and talking to a friend you could put your hands down her pants or something.
As Gambler says; this pleases her bad- and good-girl. You actually do something sexual in public but without anybody noticing it.

Other way to do it is in a totally playful way;
"Oh, the material of your jeans feels nice! Is it the same at the back?"
And you touch her ass with a huge smile on your face.
This advice comes from a master, so give it a try

All you need to do is hold her hand dude

Too much mental masturbation kino

Twiddle her fingers , and if she does it back , it's on like donkey kong

If shes uncomfortable you need more comfort/attraction

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