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big sis who masturbates on all your favorite stuffed animals. Of course, you love them very much, so you start to associate the smell with your love, and before long you're worshiping her cock stink.
You make a new mutual on tumblr, and immediately fall in love with them, spending all night roleplaying and masturbating. You wake up late next morning, with your big sister standing over you. "hey, slut," she says, "did you enjoy our little fun last night?"
Your big sis walks in on you streaming yourself masturbating. She promises not to tell anyone if she can join in. Your little show skyrockets in popularity as people rush in to watch you get bred by your own sister.
Big sis who turns you into her little drone... Now you'll never disobey her, you'll do all the gross things she wants without a second thought. You do her laundry and her homework, and you suck her pretty cock. Of course you do, the pretty spiral told you to.
You got so so so SO sad when your big sis had to leave for college, so she decided to tie you up and put you into her suitcase. Of course, she also gagged you so nobody would hear you.
Now she's finally at college, and you love getting to snuggle her all night, and spending time with her while she's not in her classes. When she is in her classes, her roommate "takes care" of you. You can't really complain, you get more time with your new sister! And besides, your starting to get used to the smell of her cock...