My Omega Stepbrother Is a Yandere

I read the novel. I knew the plot. I had a plan.
Step 1: Be nice to the neglected omega stepbrother so he doesn't grow up to murder us all. ✓
Step 2: Set him up with the male lead so they fall in love. ✗
Step 3: ???
Step 4: Somehow become the reason my little stepbrother has a yandere awakening.
i don't know what the frick happened anymore.

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