Ann also refuses Chris in that anal scene, in the dialog Ann stops him for the same reason she stopped the MC, the animation shows a bit more penetration though.
As you know, MC gets sleepy on the couch while he waits for Ann to take a shower; he even says he can't stay awake, so there are brief moments when he snaps out of it, triggered by the sounds of intense sex between Ann and Chris.
Because MC can't stay awake, that's ridiculous. Was he drugged or does he have sleep problems? If so, it should be shown in the story. He wasn't drunk enough, and even if he had been, he wouldn't have recovered so quickly.
When MC wakes up, Chris orders Ann to perform oral sex, showing that he has much more control over her. MC's behavior, just watching, is cuckold-like, and it also suggests that their relationship was much more complex than previously portrayed.
This scene would be correct if MC just watched and didn't take any action during the "threesome" since he wouldn't participate, or if he took action by giving oral sex and kissing Ann. The options where Chris just watches are also bad, like if MC went there for a threesome.
Everything could have been avoided if the MC had the option to stay awake. Nothing would have happened after the real "threesome" with Ann. I don't see the threesome turning the MC into a cuckold; I like it up to that point, but after everything goes wrong, and I'm not saying that route shouldn't exist, it should be determined by the previous choices.
Ah, that's the problem: questionable choices by the developer, poorly thought-out excuses, lazy solutions, and numerous leaks between routes. Criticism wouldn't be justified if the developer hadn't promised to develop this type of route and made it clear from the beginning. I play pure NTR and NTS games; it's not my favorite genre, but I don't hate it. If I like the content, I'll finish it, or if the story intrigues me. What I'm avoiding are the avoidable and contradictory aspects of the fetishes (harem and Netorare). A shared harem is, at most, a corral of bitches in heat.
Regarding God, you can choose Christianity, Judaism, Islam, Bahá'í Faith, Hinduism, Candomblé, Umbanda, Yoruba... any other that creates man, they all gave free will, and they all gave an anus, a mouth, a heart.... so each one does what they see fit with their life and let others take care of their own lives.