>>1162686>>1162813>>1162809>>1162792>>1162781>>1162745>>1162721All good arguments, gentlemen, we must remember to beat this into the heads of every physician, genetic scientist, and biologist we know at the time of the construction of the Human Body 2.0:
I'd say we could start with the construction of a highly-compressible, elastic membrane-walled sac embedded a few centimeters beneath the areola in a ring-like shape with a deflated back-end (as to fill the entire breast shape) which is also optimized for the adsorption of fluids, such as water, milk, and semen, such that it can expand greatly with the influx of said fluids, and then let them leak slowly with some sort of loosely-fitting "valve rows" on the ring.
It could be composed of the same fibrous tissue as other fluid-holding organs but customized for strength and impermeability, while also leaving the central structure of the nipple intact, for other modifications (a la nipple-fucking) etc. Milk-producing glands would have to be re-arranged for space constraints, or the size of the breast in general could be increased to accommodate them.
Obviously this idea would make a perfect candidate for an "enhanced human feature" that fulfills the guidelines of the human body 2.0, which also include a high degree of customization and easily-alterable appearance based on personal preference without the need to produce direct-molecule-editing nanomachines quite yet, which also lowers the timeframe on the project. I might draw a diagram for the lulz later.
Amirite?