B-mail-fantasy! Pervert step-brother locked in chastity not to be exposed-fantasy!

Oh My... I see that you are the biggest loser step-brother! Is this what you do here all day? You have no friends and no life, you just sit here all day and play with your dick. This is so pathetic. You are the worst step-brother ever! You really need help. Well, I could be a good step-sister and help you! I'll keep you locked up so you don't jerk off all day. It will definitely cure your chronic masturbation, which you obviously have no control over! Maybe I'll let you jerk sometimes, you can come to your step-sister and beg for the key!