I have a fun game we can play, something we can both enjoy. Since you're so obviously hooked on me, i'm going to let you see naughty pictures of me that i have on my phone. BUT for every picture, you have to take a whiff of this little bottle i have in my hands.
Slowly getting higher and higher with each naughty pic i show you, making you more vulnerable to jerk to whatever picture i pull out ;)
No matter what remember, you love having your step-sister own your cock so you have to obey.