Sterling calms down after his initial shock and decides to hear Rebecca's explanation, but the problem is that if she
did have sex with her dog already, she'd be reluctant to
admit to it, so we're left to figure it out from clues that wouldn't necessarily hold up in court. (LOL I mean really, have you guys never been lied to?)
On one hand we have Rebecca's dog dildo and her story. The unusual dildo is highly suspicious, especially how eager she was to explain away the dildo as "alien" and not dog-shaped. Sure she's embarrassed, but her denial is potentially very telling. Rebecca's story is also suspicious. After she recounts falling in the outdoor shower, and Sterling says "Wow... and that really happened?!", Rebecca's reply is "Maybe...". She's either afraid of his reaction and ready to deny what she just said, or she's
lying and more happened during the shower encounter. I think she made up the part about falling, when really she
voluntarily let her dog do
something to her. It's possible this went as far as partial penetration?
On the other hand, if/when Cerberus penetrates her in the bedroom, Rebecca does seem to be having a
new experience (i.e. the knot and the temperature). Interestingly Rebecca knows a lot about knotting, and is also quick to point out that dogs can't fertilize humans. I think that even if Rebecca hadn't been fucking her dog (yet), she was likely on a path to doing it in the future anyway.
Still too much information for someone who isn't into bestiality + that licking scene + mc pretending to be that dog (don't know why all this was necessary?) a little hint would be enough to warn anyone not into it, hope it doesn't persist like this in future updates.
Although I know it may happen again because it's not the first time mc pretended to be someone else, he also pretended to be the uncle of that clerk girl Sheba although that is fine but pretending like a dog isn't.
Don't worry, I think this was a one-and-done (semi-optional) event to explore this fetish. It's fine that you don't like it, but please refrain from moralizing about it. This game is full of kinks that many would be offended by, but it's just harmless fantasy.