Chapter Text
Byleth sat in her room, the Sword of the Creator glowing dimly in her hands. The sword felt alive, pulsing under her finger tips. The energy that radiated off of it hummed along her skin. At the same time it felt like it was giving her strength and taking it away. Ever since she took the sword from the Holy Tomb she’s been unsteady, in a thick cloud of fog. She lost consciousness twice, shook like she had a fever, and felt an odd throb coursing through her body.
But...if she thought really hard about it, ever since she saved the house leaders in Remire village a few months ago from the bandits, she’s felt different. Usually detached and unemotional, Byleth began to feel new things on that day. The first was genuine panic for Edelgard’s life, the second was an odd thrill that shot down her body when Claude grinned at her and the third was a sense of understanding and pure curiosity when she looked into the ice blue eyes of Dimitri. Since that day her mind kept wandering to new and odd thoughts, her body reacting in ways she never noticed before. Maybe it was because she was not a mercenary any longer but a professor that she had begun to pay attention to people's quirks and demeanor's without memorizing them as potential weaknesses if they ever became her enemy. This life at Garreg Mach monastery was all new to her, forcing different scenarios on her, putting the lives of young adults in her hands. Byleth was able to brush off her new mix of feelings and desires until the Sword of Creator decided to ignite the full power of her unknown crest into life. Now she knew something was wrong with her.
Help...she needed help understanding this. Understanding why her body was reacting this way; what her new powers were doing to her. Archbishop Rhea wasn’t answering her questions, Seteth seemed to dislike her and Professor Hanneman was out on a mission. Her fingers shook again and she dropped the sword on the floor. Who was left that might understand this?
An hour later Byleth couldn’t pull her eyes from watching the way Linhardt’s long fingers flipped through the pages of an old book. He was humming a tune she did not recognize while trying to find the answer to her problem. His long emerald color hair hanging down along his face calling for Byleth to reach out and touch it. It looked so soft. Her hand twitched and she pushed the thought out her mind.
Byleth finally caved into his request to examine her, knowing that she could not ignore this any longer. Linhardt’s full blown curiosity in crest research might be her only savior right now, at least until Professor Hanneman returned. It felt odd coming to a student but from what she heard about the warlock he was very smart and at times brilliant for someone so young. Then again Byleth was only a few years older than him and she was here teaching.
Byleth sat unsteady on his bed, trying not to fidget while waiting for him to say or do something. Heat kept coursing through her body, threatening her vision. She closed her eyes and took a deep breath then focused on the warlock again. Seeing Linhardt so enthralled was new to her. Even though he was not a member of her class, she still couldn’t recall a time that he was this determined or active. Usually he was half asleep in the library surrounded by a pile of books, or napping under a tree in the courtyard. Again her hand twitched to reach out and touch his hair. But now a desire accompanied it, wanting to run her tongue along one his fingers.
Finally Linhardt placed the book down and moved over to her. His long fingers stretched out and picked up her left hand. A tingling feeling shot through her as her crest flashed in the room. Linhardt smiled when the flames erupted in front of his face then faded away.
“I will never grow tired of seeing such a rare crest. Professor I am so glad you finally let me research you, although I wish it was under better circumstances. You should have come to me sooner before reaching this state.”
She thought it was funny that the lazy, always napping Linhardt was reprimanding her about not coming to him fast enough.
“Now I am going to cast a faith based spell in order to examine the effects that the crest is having on you. I know it is difficult to control, but I need you to try and activate your crest, then keep it activated.”
Byleth nodded, stood up and closed her eyes. Usually her crest only appeared during an actual battle but since she received the Sword of the Creator it's been showing itself more frequently. Sometimes when moving her arm in a manner that was like a sword attack. She flexed her hand a bit, pretending like she was holding a sword. Linhardt whispered his spell and the tingling presence of light magic covered her body. Carefully she shifted into a sword pose and the Crest of flames activated. Linhardt’s spell intensified, almost feeling heavy on her body as if she was covered with a blanket. The crest slipped away from her and she moved again to reactivate it. Fire ripped through her veins as a new emotion responded to the crest and faith magic. Byleth’s body became hot and disoriented as if she was about to faint. A moan escaped her lips when Linhardt wrapped a hand around her wrist and stepped behind her, obviously preparing to catch her if she fell. Again, the faith magic increased but this time it licked along her body instead of through her blood. She moaned again and shifted into the emerald haired man for support. The grip on her wrist lessened as he placed his other hand over her hip, steadying her. The sudden sensual touch caused her to groan and push her rear into his groin. She heard him chuckle and his breath tickled her neck. For a moment her body almost forced her to turn around and grab him but she stopped herself. One more pulse of his magic and her knees buckled. He kept her up by shifting his arm around her waist. The faith magic vanished and Byleth was left shaking in Linhardt’s embrace.
“Well this is new indeed, but not completely unheard of.”
Byleth was too much of a mess to respond, but she managed a ‘hmm?’ noise as he guided her back to sit on the bed. Linhardt sat next to her, keeping a hand on her left lower arm, forcing her crest to appear again, pulling another whimper from her lips.
“Each crest affects its users differently. Mine for one has given me an aversion to blood. It wants the blood to vanish which is why it pairs well with faith magic. I can’t stand the sight of blood and therefore my crest activates in order to heal the person who is bleeding. Felix’s crest gives him added strength, but once the threat has vanished, if overused, he will collapse as the crest evens out its contribution to his. The Crest of Fraldarius requires energy. Unknown to Felix, Sylvain has filled me in on this little piece of information, apparently he had to carry Felix on multiple occasions. Now, your crest is kind of similar to the Crest of Fraldarius. When you overuse its powers it needs something from you in order to replenish it.”
“So I just need to sleep more?”
Linhardt chuckled softly and ran a finger along her arm. “No no my dear Professor, you need something much more.” His hand moved up her arm then gently touched her neck. His body pushed into her side and she moaned again as his lips pressed down on the sensitive flesh below her ear. “You need sexual release and a lot of it.”
Byleth’s eyes shot open at the lazy Black Eagle students' sudden touch and his words. He kissed her again and immediately her eyes closed and her head fell back in order to give him more access. She felt him smile at the gesture against her neck.
“Why...can’t I… just exhaust myself with…physical training?” she asked despite the pleasant distraction.
“Crests are unique in their needs. They do not accept substitutions. In your case, the Crest of Flames won’t even be satisfied with your own ministrations.”
One of Linhardt's hands rested on her thigh and immediately Byleth wished it was higher. “You will either need to find a sexual partner with high endurance and the ability to either bounce back quickly or give you pleasure in a multitude of ways or…you need to have multiple partners.”
“You...can’t be serious.” she said breathy.
He chuckled again, this time running his tongue gently across her collarbone. “I never joke about crest research.” His hand shifted up her thigh a bit, his other hand supported her lower back forcing her to arch into his movements more. “In this case I’d recommend having more than one partner. This crest is very needy and difficult for you to control. It’s more powerful than any crest I’ve seen and with that type of power comes even greater backlash.” His hand shifted again and she moved her hips, desperately wanting him to go that last inch to her center.
“What if...I..just don’t..use it?”
“That would be a great sin!” he said then bit down on her neck playfully. “Besides ignoring the power of the crest will cause an even worse reaction. Eventually it will release whether you want it to or not. A who knows what type of power and damage it could cause. You might even hurt your allies.” His hand shifted again but stopped shy of her center, his body pressing against her more. “I know you don’t want that so why not let some of your students take care of you.”
“No…” she moaned. “At least… not from my house…” Byleth knew she wouldn’t be able to properly teach if she had slept with someone in her class.
“Such a good professor” he teased. “Lucky for you there is someone right here that is not in your class. I can help you for now but I must warn you that I am not as sexually needy as most of my fellow students. You must find another, maybe even two. I am more dedicated to my studies then to pleasures of the flesh.”
She whimpered as he finally rested his hand on her center, but he did not move it, causing her to wiggle under him.
“Would you like me to take care of you today?”
His voice had a seductive edge to it that Byleth did not think he was capable of. It made the heat pooling between her legs intensify.
“Oh goddess, yes” she whined and he finally pressed his fingers against her sex. Immediately Linhardt pulled her shirt off and latched onto one of her breasts. His hand slipped between her flesh and underwear then started teasing her sex. The sound of how wet she was echoed in the small room. She couldn’t stop moaning anymore and decided she no longer cared as he slipped two fingers inside of her.
Somewhere, the very dedicated research student had learned how to please a woman. Linhardt had her cumming around his fingers in no time. She was even more turned on by the groan he made at the feeling of her walls tightening around his digits. He pulled his fingers out and licked them clean all while staring at her.
“That wasn’t enough was it?” he asked, an odd mix of curiosity and lust in his eyes. She shook her head. “I thought so.”
Linhardt undressed her, then removed his own clothes. Byleth was surprised at how gorgeous the nobleman was. Under all those thick layers was a very pale skinned but long and lean young man. He was well proportioned if not a bit too thin, but his movements were graceful and she wanted to desperately run her hands along his body. She had been with men before, mostly roughed up mercenaries but never someone so pure and beautiful. When she looked back into his eyes she noticed the way he was taking her body in as well. He reached out and ran a hand along her side, lightly grazing her breast then stomach, then hips.
“You are stunning” he said in awe.
“So are you.”
Linhardt smirked then pushed her legs open. For a wonderful minute he took his time tasting her, slowly licking up the slick from her first climax. She squirmed against him, not used to someone using their tongue on her. It did not last long before he stood back up and rested the tip of his cock against her dripping wet folds.
“May I?” he asked softly as he leaned down to kiss her neck again.
“Please...Please fuck me Linhardt” she pleaded.
That was all he needed. Gently he pushed into her, letting out a pleased moan as she tightened around him. Byleth's hands clutched at his back and she noted how deliciously soft his skin was. He bottomed out in her and she looked to see that he wasn’t even all the way in. Although Linhardt was not the thickest she had ever been with he was definitely the longest. He began to thrust, taking note of how he was hitting her. He’d analyze her reactions then adjust, ever scholarly in his endeavors. She knew he was memorizing everything he did and how she liked it, all for future encounters. They moved through several positions, him trying different things to measure her reaction, until he found one he really liked.
Eventually it was clear that Linhardt could not hold back anymore and began thrusting into her with vigor from behind. His hands digging into her hips as he pulled her to meet his thrusts. She was surprised when another orgasm ripped through her. She never climaxed in this position before but Linhardt had made it a point to find just the right angle. A few moments later he pulled out, spilling his seed on her rear.
This was not how Byleth thought this day would end. After their initial tryst, they lay naked in Linhardt’s bed and discussed crest nature some more. His hand traced down her back, while her hand moved along his smooth chest, occasionally teasing one of his nipples to get a little sigh out of him. An hour later he was hard again and pulled her on top of him. He expressed that he was rather tired from earlier but he would willing fuck her again if she did most of the work. She was more than happy to oblige, knowing she could easily orgasm on top.
After their second time, Byleth finally felt her body go back to a somewhat normal state, it was still humming with need but the heat and the disorientating feeling was gone. He was right, she needed sexual intimacy to please her crest. She sighed as she settled in to take a nap with him. Secretly Byleth hoped he was wrong about the frequency of her need. It was already bad enough that she had fucked one of the students even if he wasn’t in her house. She really wanted and needed Linhardt to be enough.