Okay, y'all better read the warnings because this is actually important.

This story is HiroomixMitsuki. It contains incest! Do not read if you do not like the topic. Otherwise, you will simply just disgust yourself. Read at your own risk!

Disclaimer: I do not own Kyoukai no Kanata.

Hiroomi was well aware that his fondness for little sisters wasn't normal for the average male teenager. He was also well aware that his infatuation for his own sister was not normal.

Hiroomi wasn't stupid. He realized that it was completely inappropriate to feel this way. So he hid it behind jokes about having a sister complex and teasing, hoping that she wouldn't realize.

It seems so silly that this makes him feel this way, but whenever he puts his hands on Akihito's waist, he wonders what it would feel like if it were Mitsuki. How her body would feel underneath his fingers, how his hands would fit against her soft curves. It was at times like those that Hiroomi hated himself the most. So he touched Akihito because he couldn't touch Mitsuki.

He knew it was all a joke when Mitsuki was cruel to him, but it just reminded him of how his feelings were absolutely disgusting. It was atrocious that anyone would want to touch their sister the way he wanted to. As more time passed, the more he became disgusted with himself.

That's why their current situation was very discomfiting to him, as he had not planned his limits ever being pushed so far. For the first time in years, Mitsuki had come to his room in the middle of the night, clutching her pillow.

"I had a bad dream," she muttered simply, her eyes not holding their normal fire. Hiroomi giggled.

"And you came to your dear Onii-chan for comfort? I'm here, Mitsuki," he cooed, outstretching his arms. He knew he would be rejected, but the look on Mitsuki's face would be awfully adorable.

He did not expect her to sit on the edge of his bed and rest her head against his chest, clutching his sweater. "…Mitsuki?" After a few moments of silence, he encircled his arms around her shoulders, careful not to get too close.

Mitsuki buried her face into the crook of his neck, and Hiroomi could feel his body heating up despite his sensitivity to the cold. She was trembling.

"This time, he killed you."

That was all Mitsuki deigned to say about her dream before continuing with her regular routine of verbal abuse. "Scoot over, stupid." Hiroomi froze. Should he allow her to sleep in the same bed as him? In most cases, this would be all right, but he was a man…with urges!

However, she gave him no time to answer for she unceremoniously pushed him to the side and snuggled his side, her warm breath ghosting over his arm. Hiroomi sighed and gave up. Wrapping his arm around her waist, he flipped her over his body, ignoring her slight yelp. He didn't want her to fall off the bed in the middle of the night so he took the outside, making sure she was closest to the wall.

"Nii-san, you don't have to go so far to protect me," Mitsuki pouted, her fists placed against his back.

For once, he teased her normally. "Says the crybaby who came to sleep with her onii-chan." Mitsuki gasped, and he stifled his laughter. She halfheartedly pounded her little fists against the expanse of his back, punishing him for saying such mean things. Eventually it lessened, and she was instead clutching the fabric of his sweater. It took all of Hiroomi's self control not to take her in his arms right then.

"Onii-chan."

"Hm?"

Her hand was pressed flat against him, only clothing separating her from his scars. "Do they hurt?" Her thumb moved over his shoulder blade.

Hiroomi suppressed a shudder. "Not anymore." He turned on his other side, his hand under his cheek. "Why are you suddenly so worried, Mitsuki? Onii-chan's still here."

She huffed, exasperated at him, and turned her back to him. A few moments passed, and Mitsuki finally said, "Akihito's my friend, but I'm afraid he might kill you someday."

Hiroomi gaze softened. Sometimes he forgot that Mitsuki cared for him, even if it was just as a sister. His fingers twitched.

He wanted to touch her.

His throat tightened up. His fingernails were making imprints on his palm, but it was only slightly painful. His heart was beating so fast that he was afraid she could hear it. "Mitsuki," he husked, his voice coming out deeper and raspier than he planned. She jumped a bit, startled at the tone that came out from his mouth. "I will never leave you."

Mitsuki peered at him over her shoulder. Their eyes connected, and Mitsuki recognized something in Hiroomi's eyes that she had never noticed before. She gulped audibly.

Letting out a little sigh, she whispered, "Hiroomi's stupid."

"Call me Onii-chan."

"Hiroomi's stupid!" she said louder than before, albeit sleepier sounding.

Hiroomi just snorted to himself, flipping sides.

"…nii-san, come closer. You're warm." She stuck her cold feet on Hiroomi's legs, and despite his sensitivity to the cold, Hiroomi didn't mind.