You know.. Barb was always inappropriate, if you read her wiki it all makes sense:
https://sonichu.com/cwcki/Barbara_Chandler
Some excerpts in the spoilers:
"According to a Facebook status Chris wrote on 29 January 2012, Barbara lost her virginity at some point during her high school years. Why Chris knows this is anyone's guess, although it's possible that he learned the basic principles of Honest Content from Mommy Dearest."
“ | I grew up in an abusive household with Barbara and my former stepfather Jerry, where physical and mental punishments ran the gambit from bare-assed beatings to cold showers to bizarre scenarios acted out with glee by two deeply neurotic adults... Even at a very young age, I knew that they would abandon me. They were both irresponsible and incompetent parents who exposed me to traumas that I would rather not remember. | ” |
-Cole (Chris' half brother) on Barb and Jerry's parenting skills
"Story time, kids. Now most of us are aware of the fire; how Barb and Chris were displaced for some time while the house was getting renovated. You know how Chris was all whiny about his legos, right? Some getting melted, shit like that...well he kind of left out that his own bed was ruined as well given it had years of grease soaked into it because not bathing is so chic in his eyes. So when they got back home Chris didn't have his own bed anymore so he was sharing one with Barb instead. This came with the horrifying addendum that Barb wanted to spoon with him; I don't know if he was little spoon or big spoon but I know she was unimpressed and one night just unloaded on him angrily enough that Chris decided to get his own bed with his own money. So it goes without saying that from the time Chris and Barb got back home until he got that grand he was sleeping in the same bed as his mother".
(quote from 2016)
"Barb's habit of cuddling with Chris had been going on since Bob was alive, and he knew of it, but, due to Barb's manipulation, he was not able to stop her. In August 2016, Chris admitted to having incestuous fantasies about Barb, prompting further analysis of their uncomfortably intimate relationship. Chris sometimes refers to her as "dear" or "darling", as he usually does for would-be sweethearts. In his April 2018 Twitch stream, when Chris got his mother to reluctantly say "turn me loose, you silly goose" after hugging him, he commented that she "used to do that more flirtingly".
When you read the wiki you see that this was a long time coming, Barb have been grooming and abused Chris into acting as her partner/servant instead of Bob well before Bob died.
Chris already has issues with boundaries and autism, imagine having to spoon with your own mom and dealing with inappropriate feelings and fantasies that it could induce.
Most people would have tried to get away but Barb threatened to kill herself and kill Chris if he didn't do what she wanted. And Chris couldn't make it on his own without support due to his handicaps so the only possible escape was to dive into his fantasy world where he could be his own person and not Barbs.
Chris is also very emotionally immature and easily coaxed into doing and believing whatever someone else wants. How would Chris have been able to fend off the weirdness growing between him and Barb? (Becoming trans may have been a possible way? it has been done before by other victims trying to become "unsexy" for their predators)
Now consider for a moment that dementia can make you lose whatever boundaries you have left, as someone who has worked with elderly at some point I find it possible that Barb could have initiated sexual contact with Chris.
Symptoms of confusion can come and go, I have seen elders who were wandering around talking to themselves suddenly become lucid and responding to you like they normally would have if they were well.
Of course there is still a chance that Barb actually was totally vacant and I'm sure that she will play it off that way even if she is somewhat lucid because she is a raging narcissist.
I keep thinking of Gypsy Rose Blanchard and how much she and Chris have in common when it comes to maternal abuse. She also had this very childish way of escaping into a fantasy world with disney princesses and whatnot and as she gets away from her mother you see her turn into a completely different, more mature person.
It will be interesting to see who Chris will become without Barb twisting his reality if he ever uploads anything again.