It's about a realistic story of pedophilia. A guy lures a little kid into his house and make him come around with scheduled time to teach him sexual things. Later his parents found out. The little kid though, always has guilty feelings because it turns out that the kid always loves him.
Well the story contains a lot more fucked up things, so read and enjoy
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https://myreadingmanga.info/horihone-saizou-uziga-waita-human-anus-rearing-eng/