Have you ever inserted just your balls into your partners vagina?

My girlfriend loved balls. One time she was super horney and wanted me to just stick my balls inside her pussy. It was hard to get them in. I had to pull them down and squeeze them tight. They did eventually make it in but not for long. Her fantasy was to sit on me cowgirl with my balls inside her and grind against my dick until she came. We only tried it the one time and couldn’t get it to work.

Has anyone else tried this?

Never occurred to either of us to insert balls into her vagina. But I loved having my balls inserted into my wife’s mouth. She loved it too