I have had the 3XL for 3 months now and my nipples have grown completely in them and are too tight. I ordered to Size 4 but my nipples were already the size of them when sucked and I needed to stretch them raher than expand. They are a nice 13mm wide at the base all the time. My new 4XL arrived today and I could not wait to try them. My nipples expand full width no problem. They draw up about 3/4 way up with no blisters so i am now going to work on them and hope they will fill them within 3 months, my ultimate goal and the end of the size I want to be.
After having them on for 3 hours and massaging them from the bottom and working up my nipples expanded nicely at the base. I shall keep working the fat up until it settles all the way.
I use plenty of lubricant that helps to keep the nipples supple and not crease so that when they have reached their ultimate goal they will be perky continuously yet soft and pliable to the touch.
I also tried the water treatment on them today, filling them with water and squeezing them over my nipples until they were 3 sided. OMG!! When they popped out after about 20 minutes it was like an electric shock.