Spoiler
Nain wander around lonely and he got hurt. People find him and treat nain wound then sha amon found it then he try to punish all servant including the younger boy who's close to nain. Nain got scared that people would get hurt because of his reckless that's why he begged to amon to punish him instead and spare the servants since it's not their fault. Sha amon punish nain while they're doing r18, sha amon saw a large and small fruits and shoved it to nain ass. Nain got uncomfortable and begged to amon to stop but amon continue shoving fruits to his ass and he even shoved a crystal something. From what I remember to the last nain cry and amon couldn't take it that's why he ask the old man who is wearing a white to erase some memories of nain, btw sha amon always do that, he always asked the old man to remove nain memories that's why nain forget everything

We are getting deliciously close to that one ch in the novel ლ(´ڡ`ლ)