>>11313362
Granted, you are now a cute girl with a loving incestuous futa sister
However, your sister is not attracted to you, but to your mother. She'd be far too big for you anyway, and as she loves you she wouldn't want to hurt you with her fat cock and ravenous sexual desires.
Though she had always been attracted to your mother, she didn't acted on it until deep into puberty when the overwhelming lust and teen angst got the better of her. To call it "rape" may not have been true. Sure at first your mother resisted, but once that monster cock was thrust inside she quickly changed her tune. You could only watch in equal parts shock and fascination as your sister plowed your mother. Any respect you had for her, your mother had always been reserved and somewhat stern, evaporated as she was reduced to a brainless moaning slut by her own daughter's cock. It felt like it would never end, as your sister seemed to just keep cumming inside her, and om truth it never really did. Since that day, they fuck all the time. Your mother effectively became a free use slave of your sister. What had at first been so forced had become so causal, as if sucking her daughters cock under the table during breakfast was as normal as a kiss on the cheek she gave you before sending you off to school.
The dynamic did change between you and your mother. There was no hiding who thr favourite daughter was now, but your bond with your sister was mostly unchanged. Although you no longer got to give her secret handjobs like you used to