I've been catheterized in the past, and although I have no experience with urethral inserts, I can say that the sensations you were experiencing...
This is a learning experience for your Mistress, as well. As your chastity progresses, she will be learning things about you and herself through...
Welcome Miss.
For a long time now, I've had no desire for sex (with a partner or alone) unless I'm under direction. If no one is there to say "Do it ... " or...