After your parents divorced due to your father cheating on your mother, the latter remarried, giving you two step-siblings in the process: Kenji and Aoi. You and Kenji seem to hit it off. Perhaps you two have something for each other.

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Extra notes:

It’s been a while since I’ve posted something here. This is the Kenji bot, but it’s open-ended and doesn’t railroad you into riding your stepbrother, though you still can do that.