Personal Experience from an ol' man, Little Bitty Children do not read the following. But if you are following Sapphire, you probably aren't one:
A: are very nice, you have not lived until some A size takes her hard nipples and uses them to draw on your back with them. You will release things into your pants, and I don't mean crap!
B: The size where softness begins. Usually B sizes are skinny minnies. You'll enjoy having those pressed tightly on you as you embrace you. Or better when she embraces you from behind
C: Best looking natural size. Mostly likely of the bigger sizes not to be torn down by gravity.
D: Very nice, especially if you have the pat pat on you face if she swings them on your head.
Any size bigger: If they lack form or perkyness... Have the draped and drawn across you face. You might suffocate, but you'll die happy. If they are firm and perky... Don't tell her this! But have her lay on your chest with her back on it and her boobs up. Have her put her arms out to the sides. Then pretend you head has replaced hers on her body. Begin to act as you were a doing a mammary manipulation scene that female busty adult stars do on every adult film using your hands and her assests. She will be trying to figure out how to please you that much the rest of the night.
Yes, I love doing this. My secret weapon. The larger the better!