the story began with Dream falling and hurt by Nightmare when his brother mentioned the past event (Dreamtale event) after they accidentally met up in an AU with am Genocide Run.

Dream snapped due to it, which eventually ended with him eating the apple.

Nightmare had pushed Dream to do so by pressuring him to take responsibility for the event instead of running away and hiding from it, and taunted him for it. After that event, Dream arrived at the already condemned Dreamtale, the place that used to be their homeland, and broke down in tears: hurt by the hallucinations of good memories, his anger and guilt towards Nightmare, the constant feeling of regret due to his brother's fate that haunted him constantly, and hatred at himself for not doing something about the things that happened to his brother, to Dreamtale, and the Multiverse.

He started to drown himself in his inner negative thoughts. He held an apple from his brother's corrupted, dying tree. Dream, lost in his guilt and sorrow, started to hear a man's voice, urging him to take a bite of the apple and exact revenge on those who had caused him and his brother such pain.

Soon after that, Nightmare managed to find Dream, and immediately became perplexed by the sturdy flow of negative emotions emanating from his brother. Alas, too late, Nightmare realized what was happening. Dream turned corrupted, being consumed by darkness, right in front of Nightmare's eyes. He had to watch, helplessly, as Dream became corrupted by his hatred. Dream had passed the point of no-return, drowned in hate and sorrow, from the corrupted apple and his horrid feelings.

(What Nightmare will do next?)