Needs. Humans needed the basics such as food, water, shelter. The incubus and sucubus' of the world needed sexual energy. Due to modern science there were pills made with human hormones that could keep a sex demon alive for about a week without raw human energy. Unfortunately, there was still no scientific evidence how to obtain raw human sexual energy and contain it. Thus, the maximum time a sex demon could live without getting desperate or crazed, was seven days.

Many sex demons on earth are born of half marriages. Meaning one parent is human and the other is a sex demon. Most traits and characteristics of sex demons come about towards late puberty. The average age: 18. Many people who are born of half marriages will know by 18. Some a few weeks earlier at the latest 19. 95% of sex demons know they are one by the time of their 18th birthday.

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Sakura honked her horn for the third time in five minutes. It was 7:30AM, it was a 30 minute drive to their hometown university. Sakura was picking up her next door neighbor Sasuke since before they were born, her crush for 10 plus years, and best friend for class. She leaned her head out the driver side window. "Sasuke! Hurry up, we are going to be late for class!" She waited another five minutes. Sasuke came out in a navy blue hoodie and jeans, with his hood up and a mask covering his nose and mouth. Sakura gave him a puzzled look as he entered her passenger door. He did not say a word and rolled the window down. In all the 19 years of knowing Sasuke, she knew he was a little socially stoic but this was very new. "Uh, everything ok?" She reached over to touch his arm in a comforting gesture. He shivered away from her touch. This was very strange for Sasuke. He was socially awkward but always gave a semblance he had felt comfort from Sakura's touches before.

"Just drive, we are late enough already… Sorry." He finally spoke, glancing at her and then back out the window.

The two drove in silence. Since Konoha University was so close to home it allowed both of them to save up their money to get an apartment within the next couple of years without wasting money on student living. Their parents were fine with it, and since they both drove a car they switched weeks of driving.

Sakura was used to talking a little with him. Sasuke kept his head close to the open window. They reached the interstate that led to the University. "Hey can you shut that? It's going to be loud on the interstate." Sakura asked while signaling her turn. He gave her a quick worried glance and then conceded. The rest of the drive on the interstate was strange. He kept shifting in his seat and glaring out the window. They finally made it to the student parking area and by some miracle made it with a couple minutes until both their respective 8:15 classes started.

Sakura parked and turned her car off. Sasuke was already reaching for the door handle. Sakura reached for his closest arm. "Hey are you ok…." She was cut off as he yanked his arm away. She noticed the slight tint of red on the tips of his ears. He got up and stepped out of her car backpack swung over his shoulder. "I'm fine, just under the weather. I have a test I got to take though. See you later." He walked away in a hurried fashion. Sakura was left a little hurt and dumbfounded. He was being very strange today.

Sakura was halfway down with her chemistry class, taking notes. When she felt her phone buzzing. Sasuke? He never called her before they went home around midday. Something was wrong.

She gathered her things and ran out of the room. Once she was clear from prying ears, she called him back, missing his first attempt.

It rang once and he answered, panting on the other line. "Sakura…huff, can you take me home, huff please?" He seemed out of breath. "Y-Yeah, everything alright? Meet me at my car." Sakura agreed, worried. "I'm fine. See you in a bit."

Sakura sped walked to her car not to sprint. She made it to the student lot and found Sasuke huddled over next to her passenger door heaving. She dropped her bag and ran over to him. "Sasuke? What is going on?" Placing her hand comfortingly on his back. His mask was gone from when they first arrived. He looked up and his face was bright red. She could have sworn his eyes looked red for a moment and then they shifted back to their normal dark gray. "Unlock the car." He said looking directly into her jade eyes.

They began driving back home, Sasuke had immediately rolled his window down and had his head out of the car taking deep breaths. The ride back was filled with Sasuke's heavy breathing, and Sakura's worried glances. She parked in her driveway since he lived right next door. They both paused before they exited the car. Sakura took the opportunity, she placed a hand to his cheek. "Sasuke, what the hell is going on? Should I be taking you to the ER? Your mother would kill me if I didn't take care of you!" Sasuke grabbed her wrist that was on his cheek. He held it for a moment longer than just moving it off of him. He looked into her eyes debating something. He shook his head, and let go. "I'll call you later." He swiftly exited the car leaving her with more questions than answers.

That Morning

Sasuke woke up earlier that day, feeling hot but not feverish. He sat up in bed rubbing the sleep out of his eyes. He suddenly clutched his stomach in pain. He noticed his morning wood as well, throbbing with a need he never knew would affect him so. He got up and went to his bathroom still clutching his stomach, he turned the shower on cold to take care of his other problem.

Once his cold shower seemingly did the trick. He went downstairs where some food could help with his stomach issue, assuming he was starving. His mother gave him a hug due to her early rising nature and offered him some eggs and toast. She placed the food in front of him. "Is Sakura picking you up today?" When Sasuke heard Sakura's name slip off his mothers tongue his head gave a sharp stabbing pain. He dropped the fork he was using to eat clattering on his plate while his hand clutched his head. His mother was by his side in a moment. "Sasuke? Are you alright?" He swatted her away. Feeling the pain in his stomach again, and feeling hot all over again. He looked up to his mother, his face a bright red. "Sasuke, maybe you should stay home today." His mother suggested. Sasuke took note of the worry and dread now lacing her dark gray eyes. He stood and dropped his plate by the sink. "I can't- have a test today." He went to go back to his bedroom still clutching his stomach. He noticed all the smells in the house seemed to hit his nostrils at once. He put a hand to his mouth trying not to gag. This was no illness he had dealt with before, if that was even what this was?

Sasuke finished getting ready for the day. He got his backpack and stood by the door. He saw Sakura waiting out in her car. His mother yelled to him before he could leave. "Sasuke! Wait! Take this." She handed him a padded mask for his nose and face. One painters or house cleaners would use it for painting or heavy duty cleaning. "What, why?" Sasuke asked looking down and putting it on. "Just trust me. Come back home when you're done with your test." She gave him a deadpan face and a hug.

Sasuke exited his house finally. He got close to Sakura's car door and was immediately hit. Even though the mask did a good enough job covering up whatever the smell was. It was a magnetic smell.

He struggled the whole car ride, hoping an open window would help whatever this was- it did not. His eyes kept hurting and getting many floaties, his nose kept being filled with her scent, and his lower stomach kept winding and unwinding waiting for a coil to snap.

They luckily made it in time but this was only the beginning of his problems. Once he rushed away from Sakura, and her unique scent he ran to class to make it in time for his test. As he raced through the hallways of Konoha University he was hit by every nasty scent and smell from everybody it seemed was in the building. He kept gagging behind his mask. He couldn't hold back. He ran to the bathroom next to his classroom and ran into an open stall and wretched everything he ate that morning into the toilet. In the process he ruined the mask his mother gave him. Shit. All the smells hit him again. Once everything left his gut he heard his friend say something behind him. "Hey Teme, you ok? Sounded pretty rough." Naruto asked him. "I'm fine, just have to take my test." Sasuke grabbed a paper towel and wiped his mouth and headed to his classroom.

Sasuke sat and finished his test, everything distracted him and he was fairly certain he did terribly. Which he could not afford. He sat and waited for the end of his class. In the middle of a lecture he kept getting aromas from everyone around him. It was becoming too much again. The nausea, burning in his abdomen, and then the impossibly hard erection straining in his jeans. His heart began to race and his eyes kept getting fuzzy. He realized he was halfway out of the classroom once he felt the stares behind him. His body moved for him on its own.

His first instinct was to call Sakura. He called her once, no answer. He waited a minute before calling her back. She called him back shortly after his first missed call. He obtained the ride home he so desperately needed. He arrived home knowing he left Sakura in the dark.

He opened the door to his house and slammed it shut without thinking. He raced up the stairs to his bedroom. He was already getting spammed with texts from Sakura. He threw his phone on the floor and walked past his mirror on the wall noticing the red eyes that stared back. Shit.

Everything was adding up.

He heard a knocking on his bedroom door. "Sasuke? Can I come in?" It was his fathers voice. Which was very unusual for this time of day, due to the nature of his high position at the Uchiha law offices.

"Come in." Sasuke said curiously. Fugaku walked in.

"Your mother called me." Fugaku made eye contact, and with a shocked expression looked towards the window.

"It's my genes. I was hoping neither of you boys would have to deal with this. Itachi ended up fine. And you are 19, I-I just assumed." His father pinched the bridge of his nose, a family trait as well it seemed.

Sasuke knew where the rest of this was going. His neck was growing warm with embarrassment. "I'm an incubus. This is bad enough, just give me the run down." Sasuke said sitting down on the edge of his bed looking at floor. "First of all let's get you a blood test to confirm. I have an appointment set up with my doctor in a half hour. I'll explain on the drive over."

The drive over, Sasuke wanted to crawl under his seat and never come out. He had never been immune to the charms of women, well more like one woman. But he never acted on anything other than once, they kissed one year ago on New Year's Eve.

His father was of course silent the way over. Of course. "I'll explain when we get a confirmation either way. The blood results are quick, 5 minutes tops." Shitshitshit. They were driving up to the hospital Sakura interned at during the week. Sasuke of course knew her schedule. "We are going to Konoha General?" Sasuke was mortified, if she saw him here she would get even more suspicious and worried.

They parked in the hospital garage. Sasuke exited the car and was greeted by a litany of smells again. He placed a hand over his nose on instinct. His stomach was turning again. Fugaku handed him a new mask. "Wear that. Even though it doesn't help a ton, it helps enough." They walked in the main entrance and headed up to the incubus/sucubus ward. The elevator ride up was bearable due to it just being his father and him.

Once the elevator doors opened he got a whiff of all the smells as well as a familiar scent from Sakura. Shit, she has to be close. Sasuke followed behind his father, tucking his hands in his pockets to hide the burden of whatever this was. His father checked them in, and they were told to wait in the waiting room. Sasuke closed his eyes, to ease some of the scent headache he was now getting.

The nurse called Sasuke back, she eyed him strangely. Then took his blood. "The results will be in shortly. Wait here." The nurse said leaving him in the exam room alone.

Sasuke rested his head against the wall of the exam room as he waited. A knock on the door sounded. In came a doctor dressed in scrubs and holding clipboard. Sasuke sat up. The doctor looked through the sheets on the clipboard.

"Well, Sasuke Uchiha was it?" Sasuke nodded in confirmation. "You are indeed an incubus. While you budded late, it is not unheard of. Things to know for your new condition." The doctor sat down and started punching keys on the computer in the exam room. He then jumped into the rhapsheet of all the things he would 'need to know'. "You will need sexual energy to survive. The maximum number of days to go between feedings is seven, or a week. Eat as often as you can, it will make the scents, and damage on your sexual partner less extreme. Forgive me, you do have a sexual partner yes?" Sasuke paled.

This was all a bit much. Also bold of his doctor to assume that. But he needed a sexual partner now? He had been waiting for Sakura. They shared a kiss on New Years last year but that was it. They had come to an agreement when they started college that they knew they wanted to be together but they wanted to focus on their studies first. So they agreed to put off a relationship and physical advances until they were completed with school. Plans changed, he guessed.

Would she even say yes?

Would she still love him?

Would she be willing to give him her energy through sexual acts?

Sasuke felt sick. He never wanted this. Hell he didn't even know this would be an issue for him due to his parents' secrecy about his father. His parents, bleh , he did not want to think of that especially with his father being an incubus. Oh god, his mother must have known when she gave him the mask this morning. And of course Itachi got off scotch free.

"Have you started getting the nausea? The high body temperatures? And the sensitivity to smell?…" Sasuke answered yes to all of the symptoms he cited they had just started this morning. The doctor punched that into the keys. "Next you will most likely experience the eyes changing color to a blood red. Then the bodily reactions. You can probably figure out those yourself." The doctor said eyes still glued to the screen. "You never answered, do you have a sexual partner?"

Sasuke stiffened again, this was not how he had viewed his day going. He attempted to pinch the bridge of his nose- blocked by the mask. "Maybe." He said stoically. "Well, you maybe, may want to figure that out." His doctor side eyed him again. "In the meantime, there are these pills I can give you. You can only take one a day. They can provide you enough energy for 24 hours, you cannot exceed seven pills in a week, or else you will end up crazed. For example, if you get sexual energy from a partner on a Monday. Then have to go on a vacation for six days. You can use those to hold you over. Regardless, I highly suggest figuring out that maybe."

Sasuke nodded, taking the prescription sheet from the strange doctor. He walked out to his father in the waiting room. Truly dreading the ride home.