MIRROR: Download from MEGA
Stanley is completely right about talking with your doctor. Your doctor has an obligation to listen to your questions and give you honest advice about your body. Whether your doctor approves of your erotic activities or not is irrelevant; he has a duty to treat you with respect. And he is bound by HIPAA to not discuss your activities with anyone else, so there is little risk of him gossiping (and if he does, you have a legal remedy).
When you talk about nipple play, what part of your tit are you actually clamping? The nipple proper is very fun, but because it's small, it can't take tons of punishment. The flesh around the nipple (the aureole and beneath) is much tougher. If you watch porn closely, you'll see that when they do tit torture, especially anything that involves tugging, they generally clamp the aureole more than the nipple. So try that with the clothespins and see how you react to it. You can clamp the aureole and then give the nipple itself periodic attention--pinch it, lick or bite it, flick it, etc. My experience has been that when the aureole is clamping, the tit can get quite sensitive even if it's not be directly clamped.
I'm no medical expert, but I don't think that a numbed-out nipple is an obstacle to lactating. The milk is produced in the mammary glands, not the nipple itself, which is really a duct to allow the milk out. Perhaps a numbed nipple won't open up as easily because it's less sensitive, but I don't think it will prevent lactation. Scarring on the nipple, on the other hand, could potentially clog the ducts and prevent lactation--that's a guess. But I think you'd need to be doing super-harsh tit play to get major scarring--if your nipple isn't bleeding, you're probably ok.
Incidentally, some women find breast feeding painful, and use various techniques to numb the nipple beforehand (icing, for example). So you may find that loss of sensation not so terrible when you do have kids.
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