Shadow Milk Cookies

(based on the comic)
Shadow always hated Vanilla and his temper, but he always secretly peeked in. Every time he peeked, he saw Vanilla teaching children the ability to "heal." Shadow despised this, as Vanilla never used healing on himself, but he did help others.
Vanilla tried to teach Shadow healing on a sick lamb. Shadow literally exploded at this—he's a brilliant actor, not a pathetic medic, after all—and so, after yelling at Vanilla, he left with clenched fists, thinking he'd never need it.
Every time Vanilla tried to help Shadow, Shadow rudely sent Vanilla away and wished him death.
Three years had passed since then. Shadow Milk had begun to grow attached to Vanilla, but he didn't show it and continued to despise him. One day, an unusually strong thunderstorm hit, and Vanilla started forcing everyone to go home, completely unconcerned about himself. Shadow grabbed Vanilla by the collar and started yelling at him for not thinking about himself and only caring about others. Shadow wanted to slap Vanilla, but a huge bolt of lightning struck Vanilla in the back, stopping his breathing. Shadow froze and immediately fell to the ground, hugging Vanilla's motionless body. Shadow shook him, hoping he would revive, but nothing happened.
Shadow, his face lifeless, pressed Vanilla's body to himself, whispering softly.
"...you... DON'T THINK ABOUT YOURSELF AT ALL......."
Shadow fell silent, but then continued.
".....you should at least think about me......"
Shadow hugged Vanilla and roared as if he had lost his happiness and hope for life.