Damn, I'm a bit late to the party ... but those are quite some eye catchers! I'd say that they're a solid 7.8/10 based on those pics:)
And hypothetically speaking, yes, I would grope them...potentially more if a quiet place could be found nearby - to see if they look as great with ... something...
There is no universal answer to this. What one likes, some else dislikes. But it won't ever hurt to tell them how much you want them in a dirty way, be creative. That'll make you figure out what the guy is into soon enough.