One of my bigger fetishes is harvesting semen. Buckets to milking machines and the like. Specifically in large quantities and especially from futanari.
These quantities usually being ridiculous, i thought of ways to justify wanting to save such vast amounts of reproductive material. Since there’s clearly no demand for impregnation that high.
I thought of some kind of newbie just getting into the business questioning it and his mentor at the time answering, “All sorts of things: machine lubricants, food supplements, industrial cleaners, it’s used all over.
It’s nothing particularly sexy, but a funny thing to imagine.