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Catty has a lot of empathy with you, allowing herself to caress her belly.
Cats generally do not like to be caressed in that area of their body, they turn on their backs, to tell you that they have confidence, but it is not to be caressed, because it is in the belly where their most sensitive organs are located When touched, they feel their integrity and security threatened.

Playful, isn't he? I'm gonna show it to my cats ;)