Rin sucked Len’s dick while he was making breakfast, so when she was washing the dishes afterwards it didn’t really surprise her that he started fucking her from behind without a warning. They were twins, two halves of a whole, so he didn’t have to ask her any more than he had to ask his dick to jerk it off. And even when Len suddenly grabbed a knife and cut into her throat, Rin was only startled at the pain, but never questioned his actions. Her brother cutting her head off was not a situation Rin had ever imagined, and it made her all the happier to discover that as unprepared as she was, her natural reaction was to grab the edge of the sink and steady herself for him. Rin had no idea what Len was doing this for, but it being him was enough of a reason for her. It was even comforting to know he didn’t bother telling her anything, confirming the twins’ special bond. Her pussy or her head — any part of her was his for the taking as much as his was hers. Whatever use Len had for Rin’s severed head — or was it her beheaded body he was after — didn’t matter to her. It was probably something silly anyway. But by that point Rin would be well past gone, so Len was the only one who had to enjoy it. Thus as she died, Rin smiled calmly, looking forward to him doing just that.