My Mate, My Brother. {Hidashi omega verse}

1

Hiro whimpered as his first heat started. He was 17 when he presented. Everyone thought he would either be a beta, or an alpha like his brother, Tadashi. However, it became clear that he wouldn't be either of  them when he rubbed up against Tadashi when the first wave started. He was asleep when this one hit. He mumbled in his sleep, dreaming of who he wanted his mate to be. "Hnn. N-no, ah. D-Dashi. S-stop teasing me..." Hiro muttered. Tadashi woke up the scent his brother gave off. "Hiro?" He asked groggily, hearing Hiro moan quietly. He wandered over to Hiro's side of their joined room. Hiro had forgot to lock the door to his side earlier in the day, hence why Tadashi was able to get into his brother's side. "Dashi...." Hiro moaned in his sleep.
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SMUT STARTS HERE READ AT OWN RISK ⚠
(Hiro's POV)
"Dashi, stop teasing that spot." I moaned as he did a scissoring movement with his fingers. I groaned in frustration. Tadashi chuckled, "Hiro, I can't just put it in. You have to be prepared. After all, this is your first time." Tadashi explained.
"I- ah! I know th-that. Please Dashi! I yelled as another wave of heat flooded my body. I was panting and shaking as Tadashi slowly pushed into me. "Mn. D-Dashi ah, p-please fuck me." I said, pushing back onto him.
"I am, calm down." He replied. I gasped as his full length was in me. I moaned his name, looking over my shoulder at him. He started thrusting in me, making me moan and whimper in pleasure. I continued to push back against him as he thrusted. "Ah! Dashi, ngh."
"Hiro, you're really tight. Ahh. Nhh." Dashi said, speeding up a bit.
SMUT END.
Hiro groaned Tadashi's name in his sleep. His pheromones were making Tadashi crazy, just like they would any other alpha. 'This is my brother. I am not supposed to think like this.' Tadashi tried to be logical as he walked back to his own bed. He closed his eyes, trying to fall back asleep, but his senses were driving him nuts. He bit his lip, lost in thought, not having realized that Hiro had woken up as well.