"I'm home." Yukio softly called out this time as he returned and took off his shoes but didn't receive any response.Thinking that his brother just didn't hear him he walked to their room and peeked in through the door. "How did the test go?" he asked calmly then went to his desk to put all of his papers and briefcase.

Still,no reply from Rin.Yukio only looked over to his brother's side,not understanding why the other didn't speak with him.Maybe he was just too focused on the manga? The aquamarine eyed male softly sighed and just sat at the desk,attending his work.Right now,nor he was speaking to Rin.

Rin only shortly looked at his brother as came into the room. Even though the other talked to him he wouldn't answer at all. It wasn't like him to be that mad at Yukio but now it was also this unknown feelings that made him act like that.

Thinking it might be weird to never talk again he grabbed a piece of paper and wrote down on it "The test was way to hard. Besides do you have a girlfriend now?" before throwing it on the other boys desk. After that he sat down on his bed again and continued reading.

Yukio's concentration immediately vanished as the crumpled ball of paper ended up falling on his desk.He blinked and folded it out,reading the little message written on it. His eyed widened a bit. He turned around in his chair to look at Rin who wasn't even facing him.

"Nii-san? Why couldn't you just say this?" he asked with a very confused expression. "And what's with that question?" he added,being even more confused.

Rin sighed as he finally looked up from his manga and to his brother. Shrugging he grabbed another piece of paper and started to write down something. After he finished he hold it up to Yukio. "Don't want to talk. And I saw you with your girlfriend at the fountain today." Was what the little sign said.

It wasn't like him to act in this childish way when he was angry. He was angry at his brother rarely anyways so it was new to both of them. But Rin just had to know what this was all about.

Yukio blinked again with a blank expression on his face. He still tried to figure out why was Rin so childish and didn't want to talk but then he softly gasped as he stood. "I would have fogotten about today's injection dose." he stated as he went to take out the implements.

He figured that Rin wasn't speaking because his throat was hurting and probably because he actually was outside which resulted in some soreness in the throat.Thinking of that was what reminded him about the injection so this was a very poor situation for the demon male.

It wasn't long since Yukio returned with the small bottle of medicine and the syringe in his hands,also the small alcohol pad which he all placed on the table beside the bed as he began preparing to give the injection.He wasn't planning to reason with Rin as much as last time since he had piled of work to do for tomorrow since he had more classes to teach the other day.But then again,this was definitely something to make the other speak up.

"Today's injection!?" Rin said gasping softly. As he noticed that he just talked he quickly clasped his hands over his mouth. Now that sneaky brother of his got him to talk. He sighed and looked at the other boy. He still was totally against those syringes but since he felt now a bit embarrassed for action so weird last time he would just put up with it this time.

"D-does it have to be my butt again?" Rin carefully asked his voice showing a hint of fear and embarrassment. He was still angry but it wouldn't do any good to not talk with his brother at the moment. He just wanted to get this over with and everything would be good again.

"The pharmacy lady said to inject it there...I just didn't question it..." Yukio calmly stated then looked at his sibling after filling the syringe with the single dose of medication. "It's not like I haven't seen Nii-san's backside before." he added with this not amused look on his face.But it was only the truth.

He waited for the other to just prepare himself so they could just get this over with.The only things pilling up in Yukio's mind at the moment were his tasks that he had to get done.Sadly,the younger male lacked to pay attention to why Rin was acting like he was,at least he had spoken up now.

Rin sighed softly as he heard the other's explanation. He still wouldn't like that thing at all but he just wanted to get this over with quickly. So he opened his pants letting them together with his underwear fall to the ground. The demon boy blushed softly as his brother said that he saw his naked behind before.

"T-that is not the same." He mumbled still blushing softly as he finally turned around and leaned forward so his butt was stretched out to Yukio. It was weird to do this but he it had to be done. "P-please hurry."

Since the other already had everything prepared he simply began by repeating the same procedure as he did the day before.First cleaning the area with an alcohol pad from bacteria and then finally quickly inserted the needle through the other's flesh,then as needed he slightly pulled back the syringe's plunger to see if he didn't hit a blood vessel and finally inserted the medication. He was always focused on doing everything right to avoid any complications and after he was done he pulled out the syringe,holding a little pad to that area for a few seconds in case of any possible bleeding before withdrawing his hands and simply walking away from Rin to dispose of the used items.

He did what he had to do and then just returned to doing his work at his desk.Yukio wasn't sure if Rin would 'act up' more but he decided it was better to just leave his brother be while he did his work at least.If there was a reason why he was angry then it would have to be addressed but later.The male had no clue that his evening would be disturbed.

Rin hissed slightly as the needle was inserted into his butt cheek. Actually the insertion was the worse part. Having the medication flow into him was not that bad and pulling it out was alright too. Still the demon boy would never start to like being confronted by a syringe.

Sighing relieved as the procedure was over he pulled up his underwear and pants before sitting on his bed. He looked at his brother for a moment that just had gone back to his work right afterwards. Feeling thirsty Rin got back up and walked into the kitchen get himself something to drink. Just at that moment the dorm's door bell rung.

Wondering who it might be Rin walked to open it. A frown formed on his face as he saw the person. For a second he was ready to just throw the door shut into that girl's face but he didn't in the end. "What?" Was all he asked the girl. She in return smiled before replying. "Good evening! Is Yukio there? I wanted to ask him for some help with my homework."

Rin kept on frowning. Sure, he still could just chase her away but his brother might be mad if he was cruel to his girlfriend. The demon boy stepped aside and let the girl in. "I take you to our room." He said closing the door after her and then leading her to Yukio. "Hey Yukio! Your girl is here." He said arriving there and just sitting down on his bed with an angry expression.

The girl blushed at his words and quickly waved her hands in front of herself. "O-oh I'm not his girlfriend.....yet." She said whispering the last word before she turned to her prey. "Hello Yuki~ I wanted to ask you for some help with my homework." The girl said walking closer to Rin's brother.