It was an abnormal day at HQ. The clouds were up in the sky, and the atmosphere was so thick you could cut it with a knife. Mikasa was feeling odd. Not for any particular reason, perhaps it was that time of the month again. However, she knew that she had to do something. Mikasa went over to Eren's quarters and said, "I need to talk to you."

To that, Eren responded, "Hm?"

"Let me show you, actually." Mikasa said seductively.

She threw Eren onto his bed, and proceeded to strip down in front of him. Eren could see her body in all its glory. The thing that he really adored the most about her body was the fact that she wasn't too muscular, but at the same time, not too skinny. Her breasts were supple, and voluptuous, a thing that Eren noticed ever since she hit puberty. Eren's member became rock solid as she rubbed up against him. Slowly, she began to undress Eren until nothing was on him except his bare skin. He didn't know whether or not he wanted to go along with this, since she was his sister, even though she wasn't biologically.

"Grab the oil, Mikasa" she opened the drawer and scanned the contents.

"Aha", she took out a large cannister of transparent thick liquid.

"Why the hell do you even own this?" Eren snapped. She looked back into the drawer and pulled out a drawing of Eren and Levi docking their cocks.

"What the fuck? Where'd you get that?"

"I commissioned it to a girl on DeviantArt who does this. It's really amazing what technology and corrupt minds can do nowadays. Hush now." She replied.

Slowly, but surely, she began to rub Eren's member and lapped at it as if it was a lollipop. Eren groaned with pleasure, not knowing whether or not he enjoyed it. She dipped her forefinger into the transparent container, the tip of her fingers glistened with the thick oil. She proceeded to lather the oil on her hands, and started to rub on Eren's throbbing member once again. This time, Eren decided to take the initiative.

"I'm sorry, Mikasa!" He exclaimed with extreme pleasure, as though nobody was inthe HQ at the time. Seriously, where were the others?

Eren put his hands on Mikasa's head and shoved it down onto his cock. Her hair was soft, he thought in his head. Mikasa did not seem to be adverse to this, for she was going deeper and deeper until his entire 8 inch penis was inside her throat. She was slurping, which made Eren a little more turned on. The proceeded to do this for about 10 minutes, after which, Eren exclaied, "I'm cumming!"

Mikasa's eyes widened as she pulled away from Eren and began to spit out the excess amount of semen that had went into her mouth. However, she spit it onto her hand and consumed all of the white substance.

"Eren, you're still hard." Mikasa took notice as the boy kept his stature even though he had just ejaculated.

"Once again, Mikasa, I'm sorry." Eren cried.

He grabbed her by the torso and threw her onto the bed as she did to him previously. Ferociously, he spread her legs open, and was about to thrust when she said, "Wait!"

"Put on protection, I don't want to become pregnant." Mikasa said with urgency.

"I don't give a shit about that I'm going bareback" Eren said, his face grinning.