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It's just Dimitri and Byleth walking back to Garreg Mach in the afternoon. Their class had gone out on a monster-hunting excursion, and Byleth had sent the other students on ahead while he and Dimitri would sweep the area to make sure they didn't miss anything.
Dimitri is enjoying the time alone with the professor, even though they had split up to cover more ground faster while sweeping the area. Byleth is always so busy, so being able to quietly walk together is nice. Dimitri is so caught up in his own head, though, that it takes him a moment to notice when Byleth suddenly stops walking alongside him.
"Professor?" Dimitri says as he turns around. His eyes widen in alarm when he sees Byleth kneeling on the ground. He hurries over to his professor's side. "Is everything alright?"
"Don't know," Byleth groans. His face is flushed and he's leaning forward. "I think some sort of-- some sort of magic got me," he says.
"How did it happen? What are the effects?" Dimitri asks, concerned. Byleth hadn't mentioned any lingering magic when they had met up again after finishing their sweep of the area. Was this some sort of undetectable, slow-acting magic curse?
"Might have been some magic plants," Byleth says. Magic plants? There shouldn't have been any in the area. What kind of plants were in the area? Dimitri tries to remember, and then he realizes in an instant what must have happened.
"Was it the aphrodisiac flowers?"
"Is that what they're called? The red flowers that burst open with pollen when you touch them?"
"Yes," Dimitri answers after a pause. "The pollen they release has a strong aphrodisiac effect. How much did you inhale?" He guides Byleth to sit up instead of leaning forwards, and his eyes are drawn to what must be Byleth's erection straining against his pants. Dimitri feels a twinge of arousal inside himself at the sight. When he remembers that they're along out here, his breath stutters.
"A lot," Byleth says. "There was a big patch of it I walked through." He rubs the heel of his hand against his clothed erection and squirms.
"Oh dear," Dimitri says, though internally it feels like he's bursting open. He kneels down to be at Byleth's level. Byleth shoves his hand into his pants to touch himself better, and Dimitri can feel his own cock start to harden. "It looks like you're going to need some help," he says in what he hopes is not a hopeful voice.
"Dimitri, I can't let you... I can take care of this myself." Byleth's face looks pained. Dimitri glances back down at his cock, and sees the shape of Byleth's hand moving vigorously underneath his pants.
"Please, professor," Dimitri begs. An idea pops into his head-- a terrible idea, a horrible idea, an idea that he can't stop himself from doing now that he's thought of it. "
"I think-- I think the pollen got to me, too. It can stick on your clothes and spread into the air around you." Not a lie, but also not very common and definitely not what had happened in this case. "I need your help."
The professor hesitates, but Dimitri can see him wavering. His eyes glance down towards Dimitri's crotch, where his cock is hard and bulging against his pants, and then relaxes his shoulders.
"If-- if you're also affected--" Byleth stutters. "Then I suppose it would be okay--"
Dimitri pulls his pants down as soon as Byleth concedes. He can hardly believe that this is happening. His cock, in full view of the professor. The way Byleth is looking at him. Dimitri is suddenly hit by a wave of anxiety. He needs this to happen now, or it won't be real after all. He pushes his pants further down and then shuffles around on his knees, so his ass is facing Byleth.
"Please, professor--" Dimitri barely has to ask before Byleth grabs his hips and grinds his still-clothed cock against Dimitri's ass. Guilt pulses through Dimitri alongside white-hot lust. He had lied to the professor so this could happen. It was for the professor, he tells himself, knowing that that wasn't entirely the truth.
"Dimitri," Byleth groans, and Dimitri's heart leaps. The guilt from before is overwhelmed by desire. He feels Byleth's hands and pants shuffle, and then Byleth's bare cock is rubbing against Dimitri's ass. It's thick, maybe as thick as Dimitri's own cock. He pushes his ass up against Byleth's cock, wanting it inside of him already.
Luckily for him, Byleth seems to have the same idea. Dimitri can feel the head of Byleth's cock press against his rim, and then Byleth pushes his cock inside of him. His hole stretches wide to accomodate his cock, but it feels satisfying rather than painful.
Byleth hardly pauses before pushing the rest of his cock inside him. Dimitri moans as his arms buckle against the ground, trying to hold his upper body up. His cock is hard, leaking precome onto his thigh. At this rate, he won't even need to touch himself to come.
Byleth leans into Dimitri's back as he starts to eagerly thrust back and forth. He can feel Byleth's cock against his rim, the pushing and pulling sensations providing a pleasant friction that makes him shudder. Then, to his surprise, one of Byleth's hands reaches around his waist, fumbling for his cock.
"Professor!" Dimitri says with surprise as Byleth gropes him. "You don't need to--"
He interrupts himself mid-sentence with a moan when Byleth wraps his hand around Dimitri's cock, holding it with a firm grip. When Byleth starts pumping his fist up and down his cock, Dimitri's arms finally buckle all the way and he half-collapses into the ground.
It's almost too much for Dimitri. The professor's cock in his ass, the pressure of his chest against his back, his hand around Dimitri's cock. It's every fantasy about Byleth that Dimitri had guiltily touched himself to, and it's overwhelming.
Dimitri comes with a shudder. He clenches his ass around Byleth's cock, still pistoning in and out of him. Byleth keeps pumping his fist around Dimitri's cock, squeezing the last dregs of Dimitri's come out of his cock in little spurts.
Byleth's thrusting pauses for a moment while he pulls his hand away from Dimitri's cock, and Dimitri's heart sinks for a moment, until Byleth's hand goes back to his waist. His grip is tight as Byleth begins to thrust again, even more vigorously than before. His pace quickly beomes erratic as he slams his hips into Dimitri's ass. It's almost painful, but not quite, in his body's sensitivity after Dimitri's own orgasm.
"Dimitri," Byleth moans, and then he comes inside of Dimitri with one last hard thrust that pushes his cock all the way in. Warmth blooms deep inside of Dimitri, Byleth's hot come filling his ass up. Dimitri can't remember the last time he's felt this satisfied.
Byleth doesn't withdraw his cock right away, but Dimitri doesn't mind. It feels nice to be full of come. Eventually, though, Byleth does pull out of him, and some of his come comes dribbling out of Dimitri's ass, too. Dimitri clenches his hole to try and keep the rest of it in.
He hears Byleth tug his pants back up, which prompts Dimitri to do the same. He stands up shakily as he pulls his pants back over his ass. Byleth reaches out a hand to help stabilize him, and Dimitri grabs it without thinking. His palms are sweaty and covered in a thin layer of dirt, but Byleth's grip is tight.
Dimitri stands there, frozen, holding Byleth's hand for a moment. His cock is still out, pants pulled up enough to cover his ass but not buttoned back up on the front. He knows he should drop Byleth's hand, but Byleth's hand feels warm and reassuring. Eventually, though, he pulls his hand away and finishes pulling up his pants.
"Thank you for the assistance, Dimitri," Byleth says conversationally. Dimitri's heart twinges. He knows that for Byleth it was just because of the aphrodisiac flowers, but Dimitri realizes that he had hoped in the back of his heart that it would feel like more than that to both of them. Though with how close the professor played his cards to his chest, Dimitri can't actually tell. The professor believes that Dimitri was also being influenced by the pollen, after all.
"I'm happy to help," Dimitri says, the guilt about lying to Byleth creeping back to him. It's fine, it's over now. He did it to help the professor.
Dimitri turns away from Byleth, facing instead towards the direction Garreg Mach was in. Where they would likely never acknowledge this afternoon again. Dimitri tries to tell himself that he's okay with that. He already got more than he had ever expected to get this afternoon. The memory of this afternoon will be good enough, he tells himself, knowing that that's more a wish than the truth.