You can write that M!MC starts to go crazy and starts having not very pleasant thoughts against everyone until he gets tired and can't take it anymore.
I interpreted this ask in my own way, because I'm pretty sure that 'can't take it anymore' was for something different, but here we go.
I love them.
Even when Mammon breaks into my room and sneakily steals something to pay off his debts. He's the Avatar of Greed, he can't resist his nature. I've been saving up for several months to afford this stuff, and now it's gone. But things come and go. Love doesn't.
I love them.
Even when Levi throws a tantrum after I beat him in his favorite game and accidentally slashes my body with his claws. He's the Avatar of Envy, he can't resist his nature. I now have a scar, but I think it suits me. Love can't be hurt as easily as my body.
I love them.
Even when Satan doesn't come to our date. He saw me flirting with Lucifer earlier, and it was too much for him. So when I come to my room and see all the destroyed things, I understand. He's the Avatar of Wrath, he can't resist his nature. He was very sweet afterward, even replaced all the things he broke. If only he knew that my love for him couldn't be replaced by my love for Lucifer.
I love them.
Even when I find Asmo in bed with another man. It doesn't matter that we didn't discuss anything of the sort; I should have known. He's the Avatar of Lust, he can't resist his nature. He studied my reaction very closely, and when he saw that I wasn't angry, he decided that he shouldn't hide his other partners anymore. But he says that he loves me, so that's all right.
I love them.
Even when Beel constantly eats all my food. I think I lost some weight, but I'm sure that he needs food more than I do. He's the Avatar of Gluttony, he can't resist his nature. I tried to ask him to leave me at least something, but despite his best intentions, his hunger always wins. It's all right, I'll figure something out. It's great that my love doesn't need any fuel to sustain itself.
I love them.
Even when Belphie refuses to help me with anything. Cooking, cleaning around the house, or something more simple, like going for groceries. He's the Avatar of Sloth, he can't resist his nature. It must be hard, wanting to sleep constantly. I've never been in his shoes, so how can I judge? I'll do everything myself; my love will live even without his active involvement.
I love them.
Even when Lucifer gets mad at me. I didn't do my homework in time and disappointed Lord Diavolo. It doesn't matter that Mammon stole my PC and Satan destroyed the room, so I couldn't do the task. It doesn't matter that my scar hurts too much, and I feel a little dizzy from the lack of food. It doesn't matter that after finding out about Asmo's numerous secret partners, I couldn't get my shit together. I think something is breaking inside of me. It doesn't matter that I had to do all the chores alone, so I didn't have any time to find alternative means to do my homework.
I am an exchange student. And I should live up to this title, no matter what. That's what Lucifer is telling me. He's the Avatar of Pride, he can't resist his nature. He's used to being perfect, no matter the circumstances, and he expects his partner to be perfect as well. It's his way to show that he cares, and I love him for it.
I love them.
And they love me back. They feel safe around me. They would never see me as a threat. So when I come to their rooms in the dead of night and slice their throats, they don't struggle. Not even Lucifer. I look at the blood that slowly colors their bedsheets in red and wonder: When did my love become so exhausting? But now, when it's finally quiet and lonely, I smile because I realize...
Now I love them even more.










