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.
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.
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.