Angelina No, none
LazyGoat I'm guessing she already knows her sister wears a belt? Has she raised any questions about that?
It's complicated :
I didn't tell her anything, but she saw the belt eventually and asked my oldest what it was, she replied that it's underwear with an anti theft lock 🤣, she didn't actually explain what it is to my youngest, just told her to "grow up first", which devolved into calling each other names. Youngest ended up asking me, and I said that she should ask her sister, which ended in my oldest joking again and them getting sidetracked.
That was a while ago, and it seems like she still doesn't know about what it really is, but she knows there's cable underwear that has a lock.
Also, I ordered an identical belt for her, but it will take weeks to arrive still.
LazyGoat By the way, I don't think you have told how your older daughter wears her belt. 24/7 or only at home or on some other term.
Not quite 24/7, I give her breaks regularly (as long as she stays in the living room where I can see her, for example), or sometimes on her period, or if she goes outside somewhere where she won't have much private time. Also shower breaks. Also I sometimes fall asleep without locking her overnight. So not exactly 24/7, but I try to make sure she's locked at night and for when she can be alone during daytime.