knew a young gal back in the day. fairly tall, slender gal, small breasts. I guess she was a late bloomer. in the course of about 2 months, her tits practically jumped out of her chest. she went braless and wore a jacket, trying to hide them a little. and get used to them. I was one of the first to notice and I got "private" showings. I was also fucking her from time to time. they were like "tube" tits. when she wore a bra, they stuck out real far. she would kind of slap you with them, and they swayed when she walked.
a few years after that, my (now) wife's breasts grew at slower rate. she went from a B cup to a C in about 6 months. but her breasts grew rounder, fuller and out. then from C to D cup in another 6 months. I don't know if having D cup boobs is a goal for women, but my wife was surprised that she got that big and was proud of them. she would show them off just to see how much men noticed big tits. she told me, "every man looks at me now". she was 20 yrs old when this happened. she grew to DD cup size in a few more months.. her breasts were round, very firm, very full. they practically ran into each other. her chest was full of tit. she would check herself out in the mirror, then do different poses for me. asked me if I liked them. stupid question. I was initially attracted to her cuz she was cute, with great lttle ass and legs. and then she got a great set of tits. she said my big dick made her tits bigger because of all the orgasms she was having. I dunno about that but I kept on banging it. some of gfs got jealous, because they used to be bigger than she, and now there wasn't a one of them that came close.