Many thanks for the homemade videos - loved the 1st one with the squeezing.

Does she smack, slap and punch your ball?
Try this for a warmup:

You kneel on the bed, legs apart and face down. She stands or kneels behind you and slaps, smacks and punches your balls from behind.
If it hurts her hand, she can use a slipper or something.

Looking forward to seeing your next video!