I doubt this guy will outright kill or maim Reimu since she's under his 'care.' How about this for a bad end prediction: Anon's friend slowly brainwashes Reimu into turning into a trash Deibu and returns it. She starts insulting her owner and talking trash, whereupon he smashes her or throws her out to become gutter trash.
*Update* Top to bottom, right to left. From now on I'll put the parts in Japanese quotes in [square brackets], comments in (( double brackets )) and sound effects in *asterisks*
"Yu'? Yu'? Yu'?" *roll roll* "It hurts somehow? Reimu rolled? It hurts? It hurts?"
[ "S, Sorry! I didn't think you would stop there..." ] "It's okay! Sorry Reimu was in Mi-sters way too!"
[ "Does she interest you? She's called an Aquatic Marisa please be friendly with her" ] *yu pe pe pe pe*
"Mi-ster Reimu will be a good girl and wait here! I made a new friend! Mi-ster try hard at work okay..."