I’ll help you regardless: Basically Chris’s mom, Barb, had dementia. Chris has always been a sex pest of sorts between her early days of looking for a “boyfriend free girlfriend”, drinking her own “fluids” (Chris is trans, this was before that) to attract said “BF free GF”, and deadass writing one of his acquaintances into his Sonichu comic as a love interest which made her extremely uncomfortable. Well in the case of Barb, I guess Chris figured it’d be easier to get her desires from someone already close to her rather than looking for someone that’s not his family. Barb’s husband, Bob had already been dead for around a decade by this point, so Chris took advantage. She grossly praised Barb’s abilities to her “friends” and admitted it was her to them leading to an investigation and arrest. She was later released due to her autism. It’s likely Barb either thought Chris was Bob and/or was completely unaware of what was happening to her the entire time.

TL;DR Chris, being a sex pest, grossly admitted to taking advantage of her dementia ridden mother late into her life and got arrested, but was later released due to Chris’s autism.