[flamesabers]

Of course, there is always the comfort obtained by releasing the pressure of a full breast, but once that has gone there would be no incentive to be fully drained unless additional pleasure was obtained.

What about the maternal instinct/bond and the release of the hormone oxycontin during breastfeeding? I think it's plausible the additional pleasure could be more psychological than physiological. After all, breastfeeding can be an uncomfortable experience for the mother, but she may still do it because she wants what's best for her child.