Well that's a fucking wall of text. Really interested about the story behind it but sheer amount of text means that nobody probably wants to bother to translate it.
Was Reimu being trolled that if it kills it's kids, it will be taken as pet?
I don't really get the top half, but here's a summary of the second half. Good job on trolling, Anon.
Anon has a sweet drink with him when he runs into a Marisa-Reimu couple with Marisa-Reimu children. They demand sweets, but Anon crushes the Marisa.
He tells them he hates Marisas, and because there's a Komarisa, he won't give them any. After some thought, Reimu kills her Komarisa, then asks Anon for sweets.
"But..."
He thinks that Reimu is pitiful because she has a child to take care of, and he doesn't want to give anything to a pitiful yukkuri. After some thought, Reimu kills her Koreimu, and asks Anon for sweets.
"But..."
Anon says he'd give sweets to a yukkuri who is heavily injured. Reimu immediately starts damaging herself, and asks Anon for sweets.
"But..."
Anon says that Reimu's feet and accessory is in pretty good quality, so other yukkuris would give her food. Reimu screams for sweets, but eventually damages her feet and destroys her ribbon, then asks Anon for sweets.
"But..."
Reimu screams in response, begging for sweets because she's so pitiful.
"But..."
Reimu screams again, but Anon tells Reimu he likes Alices only. Is Reimu an Alice? No, Reimu is a Reimu, so Anon bids her farewell.
A family of three with a Koreimu comes by, and Anon gives them the sweets, telling them to eat it all quickly or else it might get stolen. Reimu asks why later, and Anon tells her it's because they didn't ask for sweets. Reimu laughs and says she doesn't want sweets.
"Ah, is that so? Then I won't give you any. See ya."
Reimu has no sweets. No pretty eyes. No beautiful skin. Nothing At all.