How do I know if my girlfriend likes it when I touch her breasts/ass?

Mr_killar
So me and my girl were kissing and when it gets too hot I usually grab or caress her ass and she seems like she doesn't mind it , also went ahead and held her breasts for a bit as a joke and she had this little giggle and I think she's a bit okay with it.
But the question is , how do I know if she likes it when do that or is just okay with it because I just want to make her feel good.
How do I know if my girlfriend likes it when I touch her breasts/ass?
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