Stimulate it.
No
yes they will be hard
Your eather horny or cold!
It depends on the temperature you feel; if your going from hot to cold or cold to hot whether its with water or air/wind it could make your boobs hard. Also if you rub your nipple it could make them hard.
You get cold, or stimulate them mentally or physically.
Guys LOVE Hard Nipples. It Is Easier For Them To Suck On And Wrap Their Tongues Around!
Mine seem too!
About as harmful as getting a hard nipple.
yes, if this has happened you should also watch for infection
Yes, after extended use, nipple suction does make the enlargement and elongation permanent: the nipple will not stay erect, but will stay out and function like a normal nipple--enlarging when stimulated.
To make a simple fake nipple piercing, you need to obtain a nipple ring and bend the ring with pliers so that the ring looks like a U shape which you can then apply to your nipple and adjust to your own needs.
man i have the same thing but I'm only 12 and its in my left nipple..my dad says its puberty but i don't think it is