And that's now to slaves that can't level up because of the breast orgasm task. Is it even possible to make someone cum from breast stimulation alone in this game? Because it doesn't seem like it. Slightly annoying, if I'm being honest.
If you give them big breasts by way of one of the tf pills it will put their sensitivity at over 300% which will make them orgasm.
As a sidenote their sensitivity will stay if you decide to revert the tf.