If we're discussing semantics, all of the sex in the game is feral-on-feral. A "feral", in furry vernacular, is where characters are designed akin to their natural, real-life counterparts (though with ample room for creative liberties in terms of anatomy, mainly for naughty bits), most notably having and walking on four legs for quadrupedal species, instead of being anthropomorphic/bipedal. Ferals, even when sapient (i.e. think, talk, and act like people), are still considered ferals, as the trait concerns their physical design rather than their mental acumen.
"Bestiality", meanwhile, implies generally anthro/human characters, but is defined as any non-feral, sexually interacting with feral characters, which does not occur in this game, as all of the characters are ferals.