Reimu don't want to go back to that guy's place. She say she can stay home by herself. Anon don't want Reimu to worried him. Reimu don't want her owner to dislike her so she went back and getting abuse.
Reimu didn't explain because she didn't want the Owner to stop being friends with the abusing guy. She's suffering because she doesn't want her owner to stop taking it easy.
Punching 2k$ Reimu, because he thinks it attacked a 5$(tops) Marisa koyukkuri, a couple hours earlier, for unknown reason(dude, weren't you curious? Why didn't you ask?), causing no permanent damage, without him witnessing.
Either he's got issues. His "friend" has epic socio-engineering powers. OR... these are the anon from stalk_amputation and his reimu mask assistant, playing "good anon - bad anon" all over again. They graduated from kos and now want to see how fast they can degrade a 2k$ gold badge yukkuri. Of course, the Reimu will be just coming back, begging for more, indefinetly. "Now I need to burn your face to help you" "Really? Thanks mister, please help me quickly."
It's pretty obvious the anon is doing it on purpose, using the Marisa as an accomplice and making it look like an accident.
How else would he just "happen" to have a camera that caught the Reimu saving the Marisa, but only in a way that looks like she was hurting Marisa, or have the Marisa lie about what Reimu did, or have a tape recorder handy when Marisa gave the false report?
^ Interesting theory, but I don't know. This Reimu is pretty smart and I think she'd be able to recognize faces...she was able to somewhat remember her breeder's face before. It's also possible that this anon and her owner are in cahoots as you said on another pic.
Further evidence that something fishy is going on is the fact that the bad anon, as far as i can tell, has made no mention of the Reimu "attacking" the Marisa he found in his cereal that day because it stowed away in the box and was eating it.
Yeah, I am aware that if he did bring it up, his new punching bag would probably stop coming by, but it still seems fishy to me.
Sorry to double post, but I see how this could be a prequel to the Stalk Story: near the end, expensive Reimu "disappears", as far as the owner is concerned, while in the care of the coward. The coward proceeds to forcibly mate it with the Marisa that swam up from his toilet that day and uses the resulting stalk to further his cowardly ways. He probably woulda moved on to children if it wasn't for the fact that they can defend themselves.