Enji had gone out around midday (when the children got home, never to see him) to answer a distress call. He would be back late enough that everyone would be asleep.
Her children seemed to notice a change in her (always so concerned), yet they said nothing (yet unable to change anything). Touya (he looks just like you) seemed to be in a more sour mood than usual (he inherited everything of you) and went off in the direction of the training grounds (he'll burn himself to ashes to please you). Fuyumi and Natsuo gave her their usual hugs (thank the maker they didn't-) and lingered for a bit before going off to do homework. (-inherit his destruction)
She went through the motions, making dinner for her children (they are hurting) and treating scrapes and wounds as they came (Shouto is hurting).
Night fell quickly across the compound, and when the moon was high in the sky her breath hitched.
She could hear his heavy footfalls across the hall; ever since Touya's quirk had manifested, they'd begun to sleep in separate rooms (her nightmares wouldn't stop). A blessing once the abuse had begun (she'll make them stop), but a curse for what she needed to do.
In the kitchen, she'd prepared exactly one cup of tea for his arrival. The bottle of liquid needed for the dose for a man his size had been disposed of in her bedroom trash can; he would be out like a light soon enough.
In the kitchen, there was exactly one blade missing from the knife drawer.
She waited. The hardest part was waiting. All was silent, too silent - as if the world had held its breath in anticipation for the act she was about to commit. She could not hear the soft snoring of her children from their bedrooms. She could not hear the breeze rustling through the trees outside.
She could not hear the bedroom door make the tiniest of squeaking.
She could not hear Enji's loud snores as she felt her knees make contact with the blanket.
She could not hear the sickening squelch of flesh gouging from the impact of a shining metal blade.
She could not hear the roar in her ears as she yanked the blade out.
She could not hear the searing of her flesh as she rose the knife again.
She could not hear the gurgling gasps of a man taking his final breaths.
She could not hear the world breathe a sigh of relief once Enji Todoroki was dead.