It goes beyond this. Maybe I am just too skeptical, but I saw this guy had deleted a post about being uncomfortable that his sister was in a relationship with his friend and had also posted a comment elsewhere that his friends tease him by saying they have sex with his sister. I wondered if this was another fetish poster like the guy fascinated with his belly being stabbed.

Now this post on top of the others? 95% chance this is just someone with a sister fetish.