Heavy on top, any size below
Lesbian big boobs sex is defined by one part of the body: a full chest, natural or enhanced, on a woman who may be slender, sporty or curvy everywhere else. Natural breasts are soft and heavy and move with each shift of weight; implants are firmer, rounder and hold their place when she is on her back.
Measured at the chest alone
That single measurement separates lesbian big boobs sex from BBW lesbian pairings, where the whole body is full and a big bust is only one part of it. Here the tits are handled as part of the sex itself: nipples sucked hard, both breasts pushed together so one mouth reaches two nipples, a breast rubbed along a partner's pussy. Face-to-face grinding in scissoring sets them bouncing with each push of the hips. A bra in this size closes with three or four hooks, so undressing a busty partner takes both hands and some concentration.
