I've watched the anime Moster Musume, as well as read the manga, so I'm cool with demi-human boobs. Even Koneko Toujou's mini-boobs in High School DxD are acceptable,although,as a Nekomata, in her Shirone mode, they grow to an acceptable size. My experience with real life boobs is pretty varied, from flat chested lasses to Gran Zepplins. My prefernce are about a 34 C, but I keep ending up with women carrying 38D + racks.