It's my thing: if they are heavy and the top is just an empty sack of flesh with no fullness with the real meat hanging like a full grocery sack, it's a turn off. My ideal of "heavy" boobs (compared to "firm" like the left) is full from where it meets the chest to bottom, completely full.
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I suppose if I had to pick one though it would be Stick, simply because she's been around longer.