Cowsandra Conspiracy is one one of the routes in Adventure High.
In it, the Protagonist has made Cassandra into a willing slave and milked her with the milk pumps found on floor thirteen of the dungeon.
After Cassandra has been milked a few times using them, she seems to act more and more like a cow.
Which may or may not be a good thing.
For this route, you need to have enslaved Sarah and have her in her Tough form for this route to continue.
Note that this is just a general outline for the route. It is not a walkthrough.
Finding the Milk Pumps
The Protagonist and Cassandra find the milk pumps on floor thirteen of the dungeon, in the upper left corner. The Protagonist teases her a little, pressing them against her but Cassandra claims she's not a cow, despite what she looks like.
The Protagonist remarks that s/he might find some use for them in the future, but Cassandra requests that the Protagonist keeps them away from her tits.
Note: It is possible to lock yourself out of this ending if you interact with Cassandra in the Protagonist's room too many times before finding the milk pumps.
Milking Cassandra
Back in the Protagonist's room, the Protagonist can start milking Cassandra causing her breasts to visibly grow every time s/he does, causing Cassandra to constantly end up mooing in reply.
After being milked a few times, Sarah (as long as she's in her Tough form) confronts her and tells Cassandra to say something in English. Cassandra simply moo's in reply, causing Sarah to remark that something is very strange.
Sarah confronting Cassandra
After Cassandra was milked a few more times, Sarah grows increasingly irritated at Cassandra refusing to speak English and decides to speak with the Protagonist by the time s/he comes back.
Sarah Milked
Some time later, the Protagonist comes back and sees Sarah with giant breasts. Cassandra explains that Sarah was curious how it felt to be milked and decided to use the breast pumps on her. The Protagonist remarks that she's normally doing the supervising - and is curious how long she's been at it.
Cassandra replies that it's probably been a couple of hours, causing the Protagonist to get shocked, as s/he only used them for a few minutes on Cassandra each time. Cassandra just replies with "Yeah. I know." Strangely enough without saying "Moo" a single time...
Julia's assistance
If Julia is a slave and in normal personality, when Sarah confronts Cassandra the second time, she will explain that Cassandra is speaking normal English, but it's not possible to hear what she says, as something causes it all to sound like "moo's". Sarah, annoyed, asks why she didn't say this earlier, causing Julia to explain she needed to translate it first. Sarah decides to speak with the Protagonist about it.
Speaking to the Protagonist
In the streets, Sarah confronts the Protagonist and asks to speak with him/her, saying she's worried about the milking pumps that the Protagonist had used on Cassandra. The Protagonist can either dismiss her at this point, saying she shouldn't worry about the milking pumps, which Sarah somewhat reluctantly agrees to.
Otherwise, the Protagonist can hear her out and she explains that Julia says it's something strange about them, which is why Cassandra keeps moo-ing. The Protagonist can either allow Julia to investigate them, or do it personally. Regardless of choice, Sarah accepts and relays this information to Julia.
Julia milking herself
If the Protagonist allowed Julia to examine the milk pumps, she can be found in the library. There, she's seemingly been milking herself for an unknown amount of time, saying that when she used her magic on them, she seemed to have lost control and started using them on herself. The Protagonist becomes curious what the deal with them are.
Bad Ending: The Four Cows
After seeing the scene in which Julia is milking herself, speak to Julia again in the library and another scene plays out in which Rosa gets overpowered by Sarah and Cassandra, turning Rosa into a hucow, with the four of them planning on turning all women into cows with help of the milk pumps.
Cowsandra Conspiracy - Bad Ending
After Sarah has been milked, the Protagonist heads back to his/her room. Cassandra and Sarah overpowers the Protagonist and, if Dan, feeds him a Gender Change potion. If the Protagonist was Rosa, that part does not happen.
"Cassandra" explains that she's in reality the milk pumps that's taken control over her mind at this point. Cassandra turns Rosa and Sarah into a couple of cows, both of them soon forgetting how to speak, only wanting to be milked.