Nipples can be streached out a long ways. How does one get them to stay streached? I've got nice full breasts and I'd like nipples an inch long or longer.
you need to get them pierced and then buy special nipple rings that pull the nipple outwards and stretch it
these can be hard to find
and they will be painful
pulling on your nipples wont do anything permanent to them, its will only make them a bit longer for a minute at the most
or you could consider surgery