Suggestion- Once sissy at 100% full name change option
When the sissy meter reaches 100%, and the NPC fully identifies as female (prefers using she/her only), I think their chosen name should simply replace their old name in the same way that a pet name does (well sort of), rather than being in quotes above their image next to their deadname/original name. I know it is replaced in general text, but it is still visible above the character image and is mentioned when you are in a room with them.
It doesn't have to be, but it could be an event where if they go to sleep with the bar at 100%, they will come to you the next day to say that they'd like to go by their chosen name/female pronouns permanently now, with the option to deny it and force them to go back to their deadname/old pronouns for those who are into that I guess, with a drop in love/joy and stuff. (I'm not into that, but I'm sure someone would want the option to say no, for a multitude of reasons I'm sure) Or, contrarily, the option to go all in and tell them no, they are a sissy and that's what they'll be forever, not a woman or a man, just a sissy using both he/she pronouns, with no change to the name, with a slightly less big drop in love/joy (so the name would still just be in quotes above their image).
Just a side note, this is motivated partially bc I have a deadname and seeing the deadname on a girl who tells me she prefers just she/her pronouns just makes me a bit sad