A very small, but not quite flat chest for bibo+; would map to an A or B cup and scales with your chest size.
The default bibo+ normals can look quite strong on this mod, consider using something like https://www.glamourdresser.com/mods/flat-chested-bibo-textures/ if you’d like it to be more subtle. (I am using bibo buff on the preview pic)

This mod requires bibo+: https://www.glamourdresser.com/mods/bibo/

You can use this mod however you like as long as you credit me and don’t repackage it unmodified! Bibo+ permissions apply as well.

If you’d like to commission or support me, please check out my kofi: https://ko-fi.com/cultistxiv