>girl unknowingly has extremely high prolactin levels
>it starts slowly, her breasts feeling engorged and swollen like hell all the time
>her milk starts to come in as fast as a mother after giving birth, but she has no idea how to deal with it, so she expresses the milk at every chance because of the pain, unknowingly encouraging even more production
>is given misguided advice and purchases breast pumps to deal with it, as she's leaking all the time and desperate to control her lactation
>again, she starts pumping too frequently, removing all the milk every few hours due to how uncomfortable engorgement is
>by the end of the first week she's lactating enough for twins
>by the end of the month, she's accidentally built herself what's consider a massive oversupply, her breasts super swollen and rock hard with milk all the time, up several cup sizes and making her feel and look huge
>end of the second month, she's already producing over 200 oz a day, almost the world record for hyperlactation, pumping milk starting to completely take over her life
>the pain and ache from overproducing all that milk becomes so intense she has to pump it all every couple of hours, even waking up to pump in the middle of the night, lest she risk getting sick from not getting her milk out
>she has no idea that weaning such a enormous milk production would take years to get back to a normal level, if possible at all with her condition
>she keeps desperately pumping her milk production even higher still, getting to a point where she might be stuck with a super massive hyper production of milk for life