Is a "normal" donger the only kind that can be ball-less on Bess? If so that is kinda lame, I'd be much happier if she could have a canine, horse, demon, vulpine, etc. boner without the knackers.
So maybe futa-waifu is out of the question as i kinda don't like balls on my futas. bad enough you end up a Unicorn whilst going down on them
It's hard in the sense that Bess is already sort of a monstrous code nightmare given all the variables she can have. So you have about a snowball's chance in hell of Fen or Gedan revisiting her to expand on the number of said variables by giving all her cocks ball/ no ball options.