She touched my crotch purposefully, why this behaviour?

There is one distant aunt of mine who was sitting beside me while I was driving a car yesterday and she grabbed my crotch until it got hard. I had to stop the car and asked her what she was doing. She touched it again and I removed her hands. Then she purposefully kisses me inside the car and made me touch her ass forcefully in her denim shorts. Uncle left her in January and I feel she is forcefully quenching her thirst.
She touched my crotch purposefully, why this behaviour?
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