Guys who are into girls, What you expect a girl to do with her hands when she's down on you? And girls, What do you usually do with your hands?

I just rest them on his thighs and play with his balls in between but moving my hands feel very awkward and I am afraid I might mess it up or fall down on my back if I lean too much. I don't know, it's weird for me.
Guys who are into girls, What you expect a girl to do with her hands when she's down on you? And girls, What do you usually do with your hands?
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