So, you've just finished your fetish story about a lactating pregnant woman who washes her nipples with soap and water every day. What's wrong with this story?
Lots.
Today, as a lactating mother, I will attempt to dispel some of the myths surrounding lactation and pregnancy, which will help make your stories more believable:
Myth:
Pregnant women lactate.
Fact:
Women cannot lactate without the right hormonal support. Women also cannot just spontaneously lactate without proper nipple stimulation, such as a baby nursing or using a breast pump.
Cases have been reported of adopting moms lactating by nursing their baby regularly and sometimes taking galactogogues (medicines with a side effect of lactation; most are not originally designed for this purpose). Galactogogues stimulate prolactin, one of the two hormones necessary for lactation. Oxytocin, the other hormone, is stimulated by relaxation and "bonding" feelings with the baby. After a mom gives birth, both are naturally present.
Pregnancy is an example of a state in which there isn't the right hormonal support for lactation. If lactating women become pregnant, their milk supply would, in the majority of cases, dry up, because different hormones take over during pregnancy. It is impossible for women to lactate when pregnant the way they do, say, when nursing a two-month-old.
If you hear about colostrum, or pre-milk, that can show up during the second half of a pregnancy. It has more antibodies and protein than regular human milk and is clear or yellowish and there's just a drop or two of it, not spewing white streams of milk. Colostrum turns into regular milk after about 2-5 days post-birth. When that transformation happens, it causes engorgement.
Myth:
Lactating women's breasts are always engorged.
Fact:
Mother Nature sends in a huge oversupply to start with, but the mother's body adjusts to make milk on a supply-and-demand basis after a couple of days. If the baby doesn't feed as much one day as usual, the mother's breasts will become engorged, which she can relieve by pumping or hand expressing. If the baby continues to drop nursings, the mother's supply will go down and the engorgement will disappear.
Myth:
Pregnant/lactating women are always horny.
Fact:
Pregnant women, like any other women, go through phases where they are hornier than other times. Their heightened senses and higher genital sensitivity both work for and against better sex during pregnancy.
Also, keep in mind for lactating women that if the baby doesn't sleep through the night yet, the mother might rather catch up on sleep than have sex, and this is completely normal. Another thing that can happen is because the hormonal balance is different and ovulation is often halted, the mother may simply have no interest in sex. This is normal, too, and the return of periods and ovulation combined with the baby sleeping better will often cause a resurge in the mother's horniness similar to prepregnancy.