A/N: Expect naughtiness in this chapter~

Heat

It happened randomly one day about a week after Arthur moved to Hetalia. Arthur woke up from his and Alfred's self-proclaimed sleeping spot underneath a tree all alone. Arthur frowned at this. Alfred never passed up the opportunity to sleep cuddling against Arthur (Arthur had grown too used to it to be bothered by the cuddling anymore). It was strange to wake up to find the Hetalian absent.

He looked about him and noticed that the rest of his pack was missing as well. Unnerved and feeling a little worried, he stood and walked towards the house. Usually if they weren't sleeping they were at the house for food or whatever other reason. However as he got near it, he was tackled into a hug.

"Oof!" He grunted.

"Arthur!" Nicole cried in a soft tone, looking worried. Arthur was immediately alert. "Oh my god, Arthur you have to get away!"

"What? Why? Nicole, what is the matter?" He demanded, capturing the girl. He spotted Kiku run into the house carrying Zack and Roger and felt fear course through him.

"Arthur, how are you feeling? Hot? Needy? Anything?" Arthur was baffled by Nicole's questions.

"Wha-no! I want an explanation for your behavior!"

She looked him over once and said, "Shit, you're so screwed. We need to get you out of here now before-"

"Artie! You're awake!" Arthur looked over to see Alfred appear a short distance away, Gilbert and Matthew trying desperately to drag him back and failing. His face was bright red and his eyes were shining with something Arthur knew was familiar but couldn't quite name. He was grinning like mad. Arthur was instantly on alert.

Nicole started shoving on Arthur. "You have to run!"

"Why?" Arthur demanded, not liking being shoved and holding his ground.

"Just run, damn it!" Gilbert shouted at him. "We can't hold him back much longer!"

"Let me go, guys! I can't go to see my mate, all of a sudden?" Alfred demanded, annoyed.

"No!" Matthew grunted.

"What is this nonsense?" Arthur asked and slipped around Nicole –who gasped in horror- to approach the other males. Alfred's eyes sparkled even more as he approached and struggled more to reach him. "Just let him go."

Gilbert looked at him. "You said so." He released Alfred.

"Gilbert!" Matthew and Nicole shouted in alarm and Alfred broke free of his brother and tackled Arthur to the ground, shoving his lips onto his.

Arthur broke the kiss, shocked. "What are you doing, idiot!" He shouted, mortified as Alfred began to attack his neck and run his hands across his body.

"It's too late!" Nicole bemoaned, looking completely for Arthur as the man shoved at Alfred to get him off. Alfred refused to move though and Arthur felt his body unwillingly responding to his mate's touches. He moaned softly and then blushed for doing so.

"Alfred, stop! Our pack is still here!" He wiggled and gasped as he felt Alfred's erection rub against his own. "Fuck!"

Alfred paused this time, contemplating it. Arthur suddenly realized what the shine to Alfred's eyes was: completely unrestrained lust. "You're right." He turned his head over his shoulder to look at his packmates and glared ferociously and snarled, "Get the fuck away from us." They dashed into the house without a second thought. Arthur was shocked by this change in Alfred and honestly felt a little afraid. Alfred seemed to not like how close they were to the house and scooped Arthur up in a princess-hold. "Let's go somewhere more private." He said and ran into the forest. When they were a good distance away he placed Arthur on the ground and began his ministrations again.

Arthur wouldn't have minded this suddenly lustful Alfred, but he didn't like how fast everything was going. Alfred was moving as if in a hurry and Arthur wanted it a little slower. He tried to coax that when he entered Alfred's mouth, but Alfred would have none of it, growling at Arthur for being too slow. It was as Alfred ground them together (and through his now hazy mind) that Arthur realized that Alfred's body was burning up. He felt as if he had an alarmingly high fever.

"Alfred…" he panted, trying to concentrate, "are…are you sick?"

"No. No, I feel more alive than ever." Alfred responded before capturing his lips and lifting Arthur's hips. "I'm alive and I need you so fucking badly, Artie." Arthur was about to shout out about preparation but Alfred didn't give him the chance as he plunged straight in to the hilt. Arthur screamed out and clung to his mate, his body trembling with pain.

"That fucking hurt, you blasted fool!" He scolded, furious that he was in pain.

"Sorry. Sorry." Alfred murmured, showering his face with kisses and licking away his tears. Even his words were hurried. It was like he didn't have enough time in the world to do what he wanted. Arthur grudgingly accepted the apology and felt much better when –as if to make up for hurting him- Alfred pulled back and struck right in the spot Arthur needed. This time Arthur screamed out in pleasure. He wasn't quite sure what it was as Alfred moved against and within him, but there was something that caused his heart to pound –a type of scent in the air. He couldn't quite place it at first but then he recognized it as Alfred's –only it smelt different from the musky scent he naturally held. It was much stronger and thicker and it burned Arthur's every sense pleasantly. He was drowning in Alfred's scent and he couldn't bring himself to care. In fact, it felt like a sexual stimulant building his orgasm much faster and when he finally came with a cry it was more intense than he had ever felt it before.

He collapsed as Alfred pulled out of him and rolled over to take great gasping breaths. "Amazing." Arthur said and closed his eyes for a rest when a moment later Alfred was back over him kissing him. Arthur turned his head away. "What are you doing?" He asked but Alfred sucked on his neck and nipped at him. Arthur's body began to respond, shocking the human. He shouldn't have been able to recover that fast from his orgasm. It had never happened before. He felt that it was in response to Alfred's aphrodisiac-like scent but that didn't mean he didn't want an explanation. He was still tired. "Alfred, stop!" He said.

"I can't." Alfred growled, feeling the need to mark up Arthur's inner thighs now, "I can't stop, Artie. It's so hot. You're so hot. I need you. I need to touch every part of you. I need to taste you. You're mine, Arthur, and I want you covered in my scent." He pressed a hurried kiss to his lips.

Well if that's how you want to play… Arthur took the moment and pushed Alfred onto the man's back, startling the alien. "Then let me top this time. You should let me top more." He leaned forward and opened Alfred's mouth to his invasion. Alfred took it wholeheartedly and startlingly submitted to Arthur completely.

"Then take me, Arthur." Alfred said when they pulled away, his eyes gazing seductively at him. How could Arthur say no? He moved to soak his fingers in saliva in order to prepare his mate, but Alfred objected. "Don't. I just want you."

"Alfred, it'll hurt-"

"I don't care." Alfred wrapped his arms around Arthur's neck and brought him down. "I just want you in me." Arthur groaned and positioned himself quickly and entered his mate –wanting nothing more than the thrust into him hard and fast. Alfred cried out in pleasure and shuddered before pulling him into another kiss. "So good…faster, Arthur." He gasped but Arthur couldn't yet. He was overwhelmed with just how hot Alfred was. He felt that he should be getting burnt but he wasn't and the tightness and heat just felt so fucking good.

"Goddamn it, Alfred!" Arthur growled happily and started moving against his mate, setting his own pace. Alfred matched it perfectly no matter what rhythm Arthur set and it wasn't long before Arthur was brought to his end by all of the stimulation. Alfred took a bit longer and then followed after with a delicious cry that Arthur felt proud to have been the one to elicit. He pulled out and rested but didn't have enough time before Alfred was all over him once again.

It went like that for multiple rounds and Arthur realized to his dread that Alfred wasn't stopping anytime soon. It was as if he had developed limitless stamina and sex drive and was constantly coming back for more. Even though Alfred let Arthur top occasionally, Arthur didn't have that much stamina and having sex actually became too much for him to the point that he just wanted to stop for half an hour at least. He didn't understand how his body could have so many orgasms and after so long he began crying with weariness.

"Alfred, please, just stop!" He sobbed after another round (he had long since lost track of how many). His body shook with fatigue and he couldn't even move much because it all just hurt. Alfred stopped, having been about to start a new round, and stared at him. Tears flowed from Arthur's eyes and his skin was bruised with the numerous hickeys Alfred had bestowed upon him. "Please, Alfred, I can't take any more!"

"But Arthur…" His blood was boiling in his veins. And Arthur's scent was thick in his nose sending his mind into the hurricane that had suddenly developed in his head. All he could think about was being inside of that body, of touching and mating and kissing and absorbing everything that was Arthur. He couldn't think straight. He just needed to be inside Arthur searching for that release that was begging to build and come out again. "Arthur, I need you." He whispered. Why didn't Arthur understand? Shouldn't he be feeling the same? Alfred wasn't close to done yet. He wasn't tired.

"I'm sorry, but I can't. Not anymore. Please, I need to rest. I can't handle it." Arthur choked on a sob and covered his eyes. His whole body hurt. This wasn't fun anymore. He hated begging and crying like this but his pride be damned he needed to stop Alfred and force wasn't working.

Something finally occurred to Alfred in his mind. Arthur was in pain. He didn't like it. He was hurting his mate. He forced aside the burning heat in him that demanded he force himself back into Arthur and settled down next to his mate, kissing his forehead. "I'm sorry, Artie. I'm sorry. I'll let you rest. I can wait." He cuddled Arthur to him.

Arthur felt complete and utter relief enter him. He had gotten Alfred to finally stop. He would probably start up again, but he had finally gained some time for some much needed rest. "Water?" He asked. Alfred nodded and stood up to walk away. A few moments later he came back with his face dripping with water and a large leaf with plenty for Arthur to drink from. Alfred held it out to him and Arthur carefully sat up (wincing in pain and struggling against his own weight) and drank as much as he could handle. He dumped the rest on his and sighed at the cool feeling. Alfred then pulled him into his arms and Arthur closed his eyes, instantly falling asleep.

He woke up sometime later –he assumed by the position of the Star it was nearing late noon- to notice movement in the bushes. He didn't feel alarm but saw that it was Kiku and Nicole. They motioned him closer. Arthur felt much more rested –albeit sore- from his sleep and noticed that Alfred was asleep. He carefully maneuvered out of his mate's arms and limped his way over to his friends.

"What the fuck is wrong with him?" He demanded in a whisper, not wanting to wake Alfred.

"He's gone into his first heat." Kiku said. Both he and Nicole were holding their noses. The mixed mate-scent of Arthur and Alfred was so strong it was choking them. It's a pain to get close to a heat site during this type of thing unless you're part of it but they felt that Arthur deserved an explanation.

"Heat?" Arthur understood that animal term and understood it enough to see why Alfred was acting the way he was. "But why the hell won't he stop?"

"The fact that you managed to stop him shows just how much he cares for you, Arthur." Nicole stated, looking a little impressed. "Usually with mating it's an all-day occurrence."

"How the bloody hell can it go all day? What about food? Or rest?"

"Well, when one mate's heat is triggered usually the other's is as well so that they both have equal stamina and can easily go all day. They're worn out by the next day, though." Kiku explained. "It happens about twice a year."

"It's different for you humans, I guess." Nicole continued. "I didn't realize that you didn't have heats. I tried to warn you but…" Arthur glared slightly.

"So you mean I have to deal with this for a whole day twice a year?"

"Oh no!" Nicole shook her head. "That's only because this is Alfred's first heat. They're triggered after finding a mate but I guess it was put off because of his mate's absence. After the first one they become paced and much calmer. Like I said, the fact that you got him to stop so that you can rest is a miracle; the first heat is a blaze that feels like it'll consume you unless you mate and is practically unstoppable."

"I'm just thankful that he stopped so that I could sleep. I felt like I was going to pass out."

"He's waking!" Kiku hissed.

"Good luck, Arthur!" Nicole said and the two ran off. Arthur hurriedly made his way back to Alfred and closed his eyes to pretend he was still asleep. Above him Alfred woke up and whimpered slightly seeing his mate was still sleeping. But nonetheless he didn't try anything and Arthur fell asleep again to wake up a bit later. Feeling pity for his mate he allowed to go for another few rounds. This continued for the whole day, alternating between marathons of mating and sleeping. Arthur dreaded the next time Alfred hit his heat and hoped it wasn't anytime soon.

Alfred slept all day the day after only waking to relieve himself and to eat and then promptly pass out again. Matthew gave Arthur a type of plant to chew to help dull the intense pain his body was under. He was glad to have the day of space from his mate. He was annoyed with him and didn't want to really look at him. His packmates expressed their sympathies realizing that a Hetalian's mating cycle was probably very harsh and strenuous for a human whose heat didn't activate with its mate.

A/N: Poor Arthur. He has it rough with these crazy aliens. The things he has to put up with. Sometimes there's such a thing as too much sex.
Francis would have a field day, though. XD