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It wasn't a matter of tradition. Baelor knew that – he knew it from the moment he first felt weird when looking at his brother. But he also knew that for alliances, he should marry outside the family.
He was raised with that knowledge in mind; and that he wasn't less Targaryen for also being a Martell, just like he wouldn't be more Targaryen for marrying a relative.
“Brother, spar with me!”
“Brother, help me with my valyrian pronunciation.”
“Brother, I had a bad dream.”
Brother. Brother. Brother.
Baelor would feel his trousers getting tighter and tighter every time he heard that little, innocent word. Good thing he managed to come on top and convince their parents he had to marry Maekar.
“Brother,” Maekar looked at him with a scornful smile, “End your existence.”
Baelor laid on his side, looking at his wife with confused eyes. What had he done now? They had been on good terms now that Maekar had accepted that he got pregnant for the fifth time.
He took Maekar's hands, kissing them, “What is bothering you now, sweetling?”
The omega rolled his eyes, “You, lēkia.”
He sighed, knowing there was no way he could win this fight.
“And what can your big brother do to help you?”
“You could start by asking Aerys if there's any way of making you infertile. Or, ask uncle Brynden and aunt Shiera if there's some potion you could take.”
Baelor didn't tremble. The first time he heard this, he got so shocked he was left speechless – only for some time later, for Maekar to beg him for his knot and to put another pup in him.
“I will do this tomorrow, my love.”
He wouldn't.
“Five, Baelor. Five!” Maekar dramatically let his head fall on the pillow.
“The Seven will bless us with yet another healthy babe, sweetling,” he kissed Maekar’s forehead.
“Hm. Then after this, I will only let you fuck my arse – or spill in my teats.”
Would he? Maekar would bite him anytime he tried to spill outside.
In fact, they were only in this situation because Baelor tried to spend in Maekar’s face and the omega got angry, asking if he was a ‘cheap whore’, and if Baelor hated him.
“Yes, my love. Next time we’ll do it your way.”
Maekar looked at him for a second. Then another, and two seconds turned into a whole minute. Oh no. The alpha knew that look – was used to seeing it for one and twenty years now, and while Maekar didn't look at him like that much before, he would now do it all the time.
His rage – that was also his ‘talk to me and I will kill you’ look.
Maekar had been sweet in his other pregnancies, or at least wasn’t angry all the time: with Valarr he was anxious due to it being his first pregnancy; Daeron made him scared of his nightmares and he hugged Baelor tightly when they slept; Aerion made him want to be in the training grounds the most he could and Aemon got him eating books for breakfast.
Now this babe, this one would be a fighter.
“You are mocking me, you cunt,” Maekar lifted his body, clumsy due to his heavy belly.
Baelor’s eyes went directly to his chest – barely covered by his see-through red nightgown. The alpha licked his lips, while Maekar sat and started ranting, probably talking about how Baelor had no idea how it was to be pregnant and that his entire body hurt.
Seven, his little brother was a sight to behold. He stared at Maekar’s body like an idiot.
“...and I tell you, your child won’t stop moving, brother!”
“...it’s all your fault, big brother.”
“...I should cut off your dick, you cunt of a brother.”
Brother. He felt his cock getting hard just from hearing that word.
‘Yes, call me that. Call me that again, please.’
Maekar snapped his fingers in front of him, taking Baelor out of his haze. He looked angrier than ever, lips together and brows furrowed.
“Are you listening to me?!”
The alpha scratched his head, “Of course I am, sweetling.”
“...so you agree that I should move to Summerhall to run away from you.”
“Ye- what?!”
Maekar laughed in his face, “You weren’t listening. I knew it, brother! You’re a-” his eyes fell down to the blankets, where there was a tent between Baelor’s legs, “What is that?”
“What do you think it is, valonqar?”
“No, you idiot. Why are you hard? I’m scolding you, brother.”
His cock twitched, Maekar tilted his head, a small smile showing up on his face.
“Did you get harder, Baelor?”
Baelor shrugged, not embarrassed, “Any alpha would get hard from the sight of his pregnant wife.”
“You are a pervert, lēkia,” his cock twitched again and Maekar pointed to the tent, “Wait, are you-” he touched it with his fingertip, smiling, “-are you getting harder from me calling you brother? Is that it?”
He was. Maekar lifted the blankets and pulled down Baelor's trousers, grabbing his cock with a full hand.
“Wait-”
“You sick fuck, getting an erection from me calling you lēkia.”
The omega spat on his cockhead, using his thumb to brush the sensitive tip. He pressed it, getting a moan from Baelor – he hardened his grip on his cock and used the pre-come to make it easier for him to jerk the alpha off.
“Do you like this, lēkia? Your baby brother jerking you off?”
Baelor closed his eyes, now he was embarrassed. How could he not? With his sweet wife talking like that…
“I bet you love to be reminded we are brothers, don’t you?” Maekar shook his head pretending to be disappointed, “Tsk, but I suppose this is just your Targaryen side showing up, unless…”
His other hand grabbed Baelor’s chin, making the alpha open his eyes.
“But it’s not about being a Targaryen, is it?”
“...nghn, please, sweetling.”
“Answer me,” he gave his cock a hard squeeze.
“I-it’s not…”
Maekar licked his lips, satisfied. He didn’t hurry – jerking Baelor off as slow as he could, torturing his husband.
“To think that someday you held me as a babe, that you taught me how to walk…you are a mad, mad man…” he kissed Baelor’s lips, “But I love you, big brother.”
“You…ah, you were mine from the start, sweetling.”
“Is that it? Oh, Baelor, you dog.”
“I asked the Gods for a companion and they gave me you.”
It started as something innocent, of course. He just wanted another brother, one that would be just like him. He prayed to the Seven and when his mother got pregnant again, he would talk for hours to her belly, talking about how they would be best friends and how he already loved him.
It was just a coincidence that he was also madly in love with Maekar.
They kissed as Baelor helped him to his lap, holding his wife’s waist as he slowly sat on his cock. Maekar hugged his shoulders, bringing their bodies close together.
“And what if we weren’t brothers, hmm?”
Baelor kissed his cheek, then his forehead, “I would still love you. We would be sworn brothers, then.”
The omega giggled, he started to move – his belly feeling heavier every time he bounced on Baelor’s cock.
“And what if we were smallfolk? There would be no Doctrine of Exceptionalism for us.”
“I don’t care, I would run away with you – to somewhere where we could get new names, new houses and marry.”
Maekar hid his face in Baelor’s shoulder, hiding away his tears – the alpha’s pace quickened, until the only sounds in the room were of their moans and his cock thrusting in and out of his cunt. It was almost unbearable for him, the pregnancy making him sensitive to the point he felt every brush against his walls, the tip of his brother’s cock rubbing against his cervix and sending shivers through his entire body.
“I love you, and I would love you even if you weren’t my brother, but…”
Baelor kissed his neck and Maekar looked at him.
“...but us being brothers is what makes it special, is this what you were going to say?”
“You know me so well, my moon.”
Maekar chuckled – he used Baelor’s shoulders to lift himself on his cock, then sat down on it with all the force he had. The alpha rested his head against the headboard, hands holding his ass and watching while Maekar fucked himself into his lenght.
The omega moaned ‘lēkia, lēkia.’
“Come for your valonqar, sweetling.”
“Fuck, brother- hells, nghn.”
His cunt clenched around Baelor’s cock, and he only noticed a minute later that his husband was rubbing his clit and smiling at him.
“Seven, you’re so big. So handsome for me, you’re perfect, little brother.”
Maekar couldn’t hold the tears from falling down his face, he continued to fuck himself on Baelor’s cock until he came and his cunt was almost hurting from the overstimulation.
The alpha gave him some time to recover, whispering sweet words in his ear. Maekar captured his mouth in a kiss, desperately sucking on his tongue and moaning. He pulled his cock out, then pushed it inside again, doing it again and again.
Baelor lifted Maekar’s nightgown and rubbed his belly, “You look amazing.”
“You…oh fuck…ever thought about how the babe is both your son and your nephew?”
“Assuming that is a boy,” the alpha gave him a smirk, “I have, of course I have.”
“I bet you love this, right?”
Baelor felt his ears and face burn with embarrassment, “I- Maekar!”
Maekar put his hand over the alpha’s, “Why are you so shy today, lēkia? Aren’t you proud of how you knocked up your baby brother again?”
“You aren’t real.”
“I’m very much real, my husband,” he touched Baelor’s forehead with his finger, “Now what do you think of coming inside your little brother? Do you want it?”
“Yes, please, please, valonqar. I need it.”
“Then do it. Use your right as a Targaryen: our ancestors fought hard for this, for us to fuck our siblings.”
Baelor laughed amidst his moans, Maekar was clearly trying to drive him insane and he loved every second of it.