Try all her holes

"Welp," you say with a smirk "if you want a job doing you better do it yourself."

You strip off her remaining clothes and lay her out on the bed taking a moment to admire her naked form. She does have a very nice body, you think to yourself, it's funny how you've never noticed it before. Her tits are particularly nice, bigger than you remember them and very firm. You spend a little time playing with them your dick hardening at the thought of your annoying little sister helplessly trapped inside this doll. You climb on top of her squeezing her silicone breast around your cock. You move your hips, slowly thrusting between the fake tits, loving how soft and smooth they feel.

"Mmm, you've got some nice titties there, sis." you tell her "I wonder if the rest of you feels as good?"

You reposition yourself over her face and **** your cock between her unresisting lips. Your full length sinks into her until your balls are resting against her chin. Her throat opens for you, warm and slick throat. If she had to breathe this would be very uncomfortable for her, as it is you can fuck her face at your leisure. You hump her mouth for a while, making a point of grinding your sweaty crotch against her face.

After a few minutes of that, you decide to move on to a new hole. Flipping her over you position her face down exposing her asshole.

"Ever been butt fucked, sis?" You ask taking a firm grip on her hips "I don't expect you have, most girls aren't that into it. So if you want me to stop now's your chance to say something. No? Okay then here I go..."

Chuckling at your own joke you ease slowly into her hole. It is tight, almost uncomfortably so. You have to use your fingers to collect some of the lube from her pussy in order to make her slick enough to take you. You fuck her from behind for a while slapping her firm gel filled butt until you feel yourself getting close. You pull out, her ass releasing you with a wet pop. You turn her back on to her back and push her legs apart exposing her artificial pussy. You climb on top of her, letting your full weight press her into the bed and then slowly ease into her pussy.

Her plastic cunt parts for you and you begin to fuck her. She feels amazing, soft and welcoming, just tight enough to give a good amount of friction.

The whole experience is more than a little surreal. When you woke up this morning you would never have guessed you'd end up fucking your sister after turning her into a high-end sex toy. Despite all that, there is no denying it is hot as hell. You pound her lifeless body hard and fast, not giving a second thought for her needs since she's a doll and doesn't have needs. The thinking about it that way finally tips you over the edge and you groan as you lose your load inside her.

"Holy shit!" you pant collapsing on to of her "That was intense. Who knew that my little sister would make such a great cum rag."

You roll off of her and clean yourself up while your cum slowly leaks from her pussy and think about what to do next?