I am new to NoodleBerry. I like nipples and have been pumping my nipples for quite sometime. My nipples stick out now 3/4 of an inch. What I do is I pump first my nipples for about a half hour and then I replace them with the NoodleBerry pump and leave them on for about 40 minutes. After I take the cup off my nipples are rock hard and they increase in size. Last week my friend came over after I pump my nipples he just couldn't keep his fingers off my nipples. Here I ask you the same question for how long do you pump per session? and how long interval do you take between one pumping and the next one?Its normal that nipples grow a bit from pumping. There's quite a few posts from females who are concerned about this giving them a provocative appearance and they use tape to minimise the effect. Males usually quite like it that their previously insignificant nipples become more prominent.