surprising opportunity

Hello all! My wife and I are aged in our 50’s and she has recently presented me with a surprising opportunity regarding chastity.
In terms of background we’ve been married for over 20 years and have two children who are now in their late teens. Our sex life was initially active but as often happens it dropped off after the kids came along. I’ve always had in interest in male chastity, femdom, male humiliation, cuckolding etc which I’ve shared with her many times. Generally she hasn’t been interested although she has made some efforts from time to time, it’s always dropped off after a while. I haven’t pushed it because I didn’t want to be a nuisance. So far the last few years I had canned it and stopped mentioning it. We then continued a normal vanilla married life with only occasional sex, which wasn’t particularly exciting.
Recentlly she said she wanted to tell me something important so I sat down and listened. She explained that since she experienced menopause a couple of years ago she hasn’t enjoyed PIV due to being dry and wants to stop having PIV sex. She expressed concern about where this leaves me and openly said she has no objection to me obtaining relief from other women, including sex workers, as long as I don’t bring any problems home. She even started looking for sex workers for me on the internet.
I gave it some thought and came back to her to explain that I don’t really want to have PIV sex with sex workers or other women and instead I want to have my cock locked up and my ass pegged like a pussy. Her lights came on and she said yes that works for her. Now for the first time she is enthuastic about chastity and has gone out and bought a few dildos and a strap on. She now enthusiastically talks about how she will now have the cocks in the relationship and how she is going to enjoy penetrating my pussy. I’ve bought a CB 6000S and she says she wants to use it and hopes to shrink my cock till it becomes a micro penis. She believes that micro penises are more obedient and submissive and should be allowed an erection and talks about how the only cocks in our relationship will be her range of multi coloured dildos.

 

Thanks for all the welcoming comments, both in this thread and also separately by DM. I've been asked by DM to comment on how often I get to cum and I thought I'd answer here so it's visible to all.
We've settled into a routine which is that I get to cum once a week, which is on a Saturday afternoon. We go shopping together on Saturday mornings, have coffee and a light lunch together and then come home early afternoon, which is when the action starts.
My wife has 2 different ways of making me cum and she knows that I love one and am really scared of the other.
If I'm been good and she is happy with me, then I'll get the 1st method which is that I lie face down on the bed wearing nothing but the cage. She lubes me up and enters with one of her dildos. She then puts her strapon on a gives me a good pegging. This will result in a prostate orgasm which is both powerful and enjoyable. In the process I'll fill up my little plastic cage with cum. Afterward she will unlock me for cleaning and put it on again.
However, if she's not happy with me, for example if I have done something wrong or underperformed during the week, then it's a different story. She will make me lie face up on the bed and she will fetch her wooden spoon she calls the "smock smacker". She will then sit on my chest and lift my legs up and forward and place them under hers. I'm then immobile and can't escape. She then uses the "smock smacker" to give by bum a punishment spanking. I try to wriggle but can't as I'm held firm in this position. All I can do is apologise and cry. After she is finished with the buttock and perineum spanking she will move onto my balls. She hits them much less hard but as they are tight and fixed in the cage they can't move and it really hurts. She hits them with a certain rhythm until I cum sobbing and fill up the little plastic cage with semen.
Most weeks I have some idea of what I'm going to get but sometimes I think it's 50/50 so I'm not sure. It certainly keep Saturday mornings on tenterhooks for me.