Well, actually my former fiance' fit both descriptions. She was large for her size and over the course of our relationship, she got into my BE thoughts. When I met her, she was a very athletic/petite 24 year old with a large 34 C. It doesn't sound like much, but with the rest of her so small, she looked great. The first date even involved her saying (while she took her shirt off).."Ever been with a girl with breasts like mine?" Yes, teasing confidence is always a turn on. To mine & her delight, she filled out to a D within a few months of our relationship. She'd have women at the gym and work ask her if she had implants...so funny. She'd even try on her C cup bras just to show how much she'd grown...just to excite me.
Now, another great thing was that she, like some women, would enlarge during her period. However, her's was always noticeable even with clothes on. She'd take a bath to relieve the soreness from the growth and of course tell me to come into watch her in the tub. Just so I could see "them" float. She'd stare at herself with amazement and say "I'm so swollen up, wow, I'm so big". Nice.
Now, the best part. During this "swollen" time, she'd take advantage of me (poor me) and have sex. Now, one thing I didn't mention...she swells a bit during sex. (actually most women do swell up to 25% larger during sex...saw that on TLC) Well, she did, so during her already swollen time, sex made them even more irresistable. So amazing.
She'd have to wear sports bras since her normal ones wouldn't fit. I prefer that look anyway. So, yeah, she played along with the BE fetish and would say all the right things like "look at how much I've grown for you", "oh my god, I'm sooooo big", "wow, I've even grown bigger since this morning"...all the while caressing, squeezing and licking them. It was torture. Soon after our break up, (because she was nuts and had an extreme addiction to pain killers and Bulimia)I found this website...and found that I was not alone in this BE desire. Now if only normal girls would act this way. It's a tough find.