There is a lot of stylization involved in modern anime/cartoon style art. Stewart is very much a person, if not a human person or even an especially decent person.
I am also keeping a sharp eye on the borders between monster and animal. I know if I crossed it, it would be nearly impossible to recoup my investment.
I am totaly for "Anatomical acuracy" for the Squirels D. as long as it huge ;p
One of my favourite other creators ThunderOne - making Leaf on Fire pokemon parody, give Pokemon Dicks that are representative of their animal conterparts. He made a couple big rodents scenes allready ;] Check it out ! I'd say his Sandslash could easly be used as temporary art for your scenes ;]
I am a bit sad you dont intend to have Shota in <future> games of yours, but I am ok with it. I am glad you confirmed it on besti.
There is also option to have besti-shota - like sex with pups or small squirels ;]
The point is - since you are not using Patreon you can have standard besti with normal Dogs or Horses in your game without problems (honestly there are some games on Patreon with such besti (Clair's Quest).
Sure some people maybe like CobraPL might be put off - but others will flock to see a rare content like that.
I for one will be really gratefull for including real Besti. Or better yet game centered arround it.
And even people that dont like it will still play the game for non Besti parts.
There is also option to make slight concessions in that regard. Instead dog/wolves you can have talking Hounds - like one from Final Fantasy for an example ;]
Instead of Horses you can have telpatic Unicorns etc ;p
Monsters are fine too.
Just dont be intimidated by narrowminded people. Trust me - Bestiality tag under your games can only make it more popular.