Hi Jade, I’m not sure if this is something you’ve had answered but I’m not sure this is even possible.
My.own nipples are very rarely erect, and nipple hardness is a natural reflex action. A quick Google search suggests having constantly erect nipples is a sign of something being.wrong.
Perhaps ask your master if he has any tips on doing this safely. (This is how I would approach the task with Sir if I was stumped)
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