Have you think about others use of fapets?
Viewing post in SlaveBar M ~ Episode 1 [v1.4] comments
we can harvest thing with them, like with the cat woman, she can catch fish in river or something else. if you have think about making a garden we can use rabbit or others fapets for their favorite (they produce only what they like: rabbit = carrot ) and maybe if you implant a monkey or with tall fapets or powerful fapets harvest things from tree.
The auto harvesters sounds interesting, however in current context the fapets would consume/eat their favorite food (being the main idea about the taming part, that they ignore any threat instinct because of this). Maybe some other resources or just making money. Keep in mind that they supposedly have a low level of intellect, close to animals.
I was thinking about using them in a personal Toilet section of Nishy's bar (after it is leveled up enough), that way they can make money, needing to be h trained to satisfy and survive clients fetishes.
The auto harvester could be done by fapets with some intelect like the bunny in the bunny heir, they could speak and act freely, maybe this is more possible but the auto harvester would be just a + of use for fapets because they doesn't have another utility than make beer. But if you have another way of their use then the harvester thing would be too much maybe.