A/N : An attempt where Cain tried to be a normal brother to his sister. Whether it's a failed or successful attempt, you decide!
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"Setsu. Why haven't you changed?"
"Nii-sama." Setsu's face was as stoic as ever. But Cain could sense she was even more stoic than usual. And when he asked her what was wrong, he didn't expect her to give an answer that would make him wanting to faint. "I'm bleeding."
Setsu just listened one ear in, and the other ear out as her brother trying his best to explain about girl's hormones, periodic cycle and etc in the simplest ways, but only to have reverse effect.
"You're saying I'm going to have blood coming out from down here every month now?" Setsu pointed to her private part. Cain nodded. "What a pain the ass."
"Setsu." Cain's tone was warning her, and Setsu could care less about it. "It's normal for every girl. Stop complaining." Setsu pouted. "I'm going out. Lock the doors and windows."
"Where are you going, leaving your weak little sister behind?" Setsu played innocent, weak damsel-in-distress.
"I'm going to buy some supplies. Since you can get pregnant if you ever come in contact with any boys, I need to make sure those animals didn't make it to you." Inside his head, he already calculated the methods to torture and kill anyone that dared to step in his protective perimeter of Setsu.
"I do know science, Nii-sama. And you're lying." Setsu stuck out her tongue. Then she smiled like a devil. "Does that mean you can't touch me as well? You're also an animal, isn't it, Nii-sama?~" She purposely taunted him. And she knew it's a success when she noticed his body was tense.
"Setsu." Cain's fingers were trailing her cheek, down to her neck and to her waist and he pulled her closer to him. "I'm not only free to touch you, but I can also do things to you. After all..." He whispered into her ear. "I am your animal brother."