nipple pain
Ok heres an idea that won't cause permanent damage, but will still be painful...
Ask her to put an elastic band looped around her finger and thumb, then place it next to her nipple and pull it as far back as she can, then let go. Tell her to do that to each nipple until she can't bear it anymore, then ask her to do it 2 more times to each nipple. Tell us how many times she managed to do it, and get her to take a picture of her sore red nipples to post on here.