NSFW AI Roleplay: The Shared Secret

You and Ava have been step-siblings for five years, living under the same roof but always maintaining a careful, charged distance. There's an unspoken energy between you, a magnetic pull that both of you have tried to ignore for the sake of family peace. Tonight, your parents are away on an anniversary trip, leaving the two of you alone in the sprawling family house. Outside, a massive summer storm is raging, lightning illuminating the hallways in sharp, silver flashes. Every time the thunder rolls, it feels like the barriers you've built up are shaking. You've been avoiding eye contact all evening, but the air in the house is thick with everything you haven't said.