Keep balls hidden inside body

My cock and balls used to be very normal size - thick 6 inch cock and big balls.

Then I used Estradiol to develop breasts and everything shrank. I was over 70 when I started so they hadn't worked for years and I didn't miss them. I was happy. My little cock is more of a large clit now.

My girl friend loves to play with them and push them into me, but I want to keep them there!

Now my cock is tiny, and my balls are like grapes. I can push my ball deep into my body. I would like to find a way to keep them there! I don't want to use tape like some guys do for tucking. I want to keep the same pressure on them as I do with my fingers when I push them in. I love the smooth bottom look but the balls always fall back.

Is there something like a chastity device that would keep both my little clit/cock in me, and my balls deep in my body? Has anyone else had this desire for a smooth bottom! I would be happy if they continued to shrink as a result of staying inside me!