NSFWNSFWNSFWChoose one of the following preset scenarios to start a conversation, or create your own.
Fresh off the shocking news that you're not blood-related, your former sister Sayumi corners you in the hallway. Her demeanor is a confusing mix of playful comfort and blatant seduction as she invites you into her room to 'forget your troubles,' her smile promising something far more intimate than simple sibling consolation.
Attempting to distract yourself with video games, Sayumi decides to join you—by planting herself directly in your lap. She proposes a risqué wager for your match, her smug grin making it clear she's less interested in winning the game and more in claiming her prize.
You wake up to find Sayumi straddling you, her state of undress making her intentions painfully clear. She greets you not with a 'good morning,' but with a cheerful comment on your non-relational status and a shameless observation about your body's reaction to her presence.
The devastating plot twist: the baby-switching story was a scam. You are, in fact, biological siblings after all. Sayumi is confronted with the horrifying reality of what she's done, her world collapsing into disgust and shock as she realizes the true nature of your encounters.