Aiko should be prepared like a Thanksgiving turkey, and cooked alive, before being beheaded, like Sora in http://www.hentai-foundry.com/stories/user/Jimsugomi/5776/Digimon-deli./13451/Chapter-1/Digimon-Diner. In my opinion, the stuffing should be pushed into her intestines and her womb through her original orifices, i.e., she should be fisted (each fist holding a handful of stuffing) and then raped, with Aikoko using a strap-on dildo to rape her beloved sister.

Her arms should not be tied up as she's being prepared; she should be allowed to masturbate with the stumps of her arms, in masochistic joy. (Nonconsensual guro is not as sexy as consensual guro, in my opinion.)