Work Text:
Today was a special day. Very special to Hiro Hamada, at least. It was his brother Tadashi’s 19th birthday! He had been planning some sort of surprise for him for months on end, however his mind was blank when it came to ideas to surprise him. Now that today was the day, though, he needed to come up with an idea to celebrate his birthday, otherwise the day would just be pointless.
He had an entire journal full of ideas and thoughts on what to surprise him with for his brother’s birthday. All of the ideas in the journal just didn’t seem enough to him, though. He wanted something that would make him happy, something that would be so creative and so wonderous that he would start crying out of pure happiness. He kept on planning in hopes of finding something that he was satisfied with.
However, while in the middle of gathering up ideas to celebrate Tadashi’s birthday, he gasped in pain as he felt a sharp pain in his lower abdomen. He was suddenly reminded of the baby in his stomach that him and his brother had created 9 months ago. His mouth curved into a smile and his eyes lit up with excitement, an idea forming in his mind.
What if he had surprised his older brother with the new baby that they had created together?
The idea was perfect to him, however the more he thought about it, the more he started to think it wouldn’t be possible. The contraction that he had felt could’ve been a Braxton Hicks contraction. Or, if it had been a labor contraction, the labor itself would probably last for hours on end, resulting in him pushing out the baby after Tadashi fell asleep. It wouldn’t be a birthday surprise if he gave birth to the baby after his birthday.
Instead of worrying about what would happen with the baby, however, he decided to wait it out, still wanting to plan something for Tadashi just in case the baby decided to come out after his birthday. It would be better for him if he had a backup plan rather than not having a plan at all.
After successfully coming up with a backup plan to celebrate his birthday, he put the journal away in a place where only he would know where it was and carefully got up, stretching a little before walking towards his bigger brother, wanting to tell him that he was planning something for his special day.
”Tadashii? Are you still sleeping?” He walks up to his bed, gently shaking him awake with a smile on his face. “Wakey, wakeyy… come on, ‘Dashi, get up!” The bigger brother stirs from his slumber, looking at his brother with a somewhat annoyed expression. “Mmgh… Hiro, what did I tell you about shaking me awake..?”
He laughed a little, kissing his cheek and blushing a little. “Sorry… just wanted to wake you up for your special day. How are you feeling? You’re 19 years old today… so big…” He sits up against his bed and looked down at his younger brother, smiling and slightly ruffling his messy hair. “Well… I feel very happy that my cute, little brother wants to celebrate my birthday now. You’re excited for the cake, aren’t you?”
He scoffs as Tadashi teases him. “That’s not true! If anything, I’m more excited for the surprise I’m planning on giving you, big bro.” He winks at him and kisses him again after he tells him what he’s most excited for. “Huh, you’re gonna give me a surprise? Well, I can’t wait to see it. I’m sure birthday surprises from you are the best part of any birthday.”
He smiles, blushing a little as his brother strokes his hair. “Y-yeah… thanks, ‘Dashi. I promise, you’re gonna love it.” He eventually returns to his own bed, his face completely red by the time he had returned. “God… how does he make me feel so good..?” He muttered underneath his breath, somewhat embarrassed.
A few minutes later, he felt another sharp contraction, wincing as the pain echoed throughout his body. He then realized that the baby was coming out today, and his face lit up with excitement again, realizing that the surprise that he had planned for Tadashi was going to happen. All he had to do was wait it out.
Throughout the whole day, he kept on talking to his bigger brother about the surprise that he had planned all on his own, just waiting for his water to break so that he could start pushing. Every time he felt a contraction, he would cuddle and kiss his brother and try not to whimper, and it would work well. He never noticed that he was suffering from the contractions.
However, after a while, he felt a strong urge to push even though his water had never broke. He huffed out and let his body push, his muscles contracting as he felt something begin to stretch his tiny private part. “W-wha..? My water never broke… how is this even happening?” He muttered underneath his voice, surprise and a little bit of discomfort laced in his voice.
Eventually, he decided to check for himself what was really going on with the baby. He covered himself up, pulled down his pants and looked down at himself. To his surprise, he saw a small baby head, covered up by its protective amniotic sac. “Oh, my god…” He muttered again, his face having surprise written all over it. “It’s perfect… Tadashi’s gonna love you…”
He then decided to put on a pretty skirt that he had bought a year before he came out as trans. Since it was so small, he struggled to put it on, but he eventually managed to fit into the tiny skirt. He didn’t change anything else about his appearance, the only reason he had a skirt on in the first place was to lift it up to show Tadashi the surprise.
Afterwards, when he was finished with prepping himself up, Hiro went out to find Tadashi, a happy little smile printed on his face. He ended up finding him downstairs at one of the cafe tables, eating a slice of cake by himself. “Tadashi? You had cake already? Why didn’t you tell me?” His smile from before turned into a slight pout as he pointed out the fact that he had no cake.
”Well, Aunt Cass was gonna give you cake… but, you were in your room. She thought you were sleeping throughout the day.” He groaned as he heard that, upset and disappointed that he hadn’t gotten to eat cake. “But, don’t be too disappointed. She still saved you a slice.” Hiro’s eyes sparkled yet again as he heard that his aunt had still saved cake for him.
”Can I have it?” Tadashi laughed softly as his younger brother asked for the slice of cake. “Sure thing, kid.” But while he got up to get him the cake, he felt a sharp pushing contraction, which snapped him back to what he was originally supposed to tell him. “Wait… Tadashi, before you give me the cake, can I show you the surprise I was planning on?”
Tadashi smiles, looking down at his younger brother as he mentions the surprise. “Of course, Hiro. You can show me your surprise now.” His energetic smile widened as he heard his cue to show him the surprise. He kissed his brother on the lips before gently picking up his skirt. “You’re ready, right? I don’t want this to be too much of a surprise.” Tadashi looked down at the skirt, curious as to what he was gonna show him. “Yeah… I’m ready.”
Suddenly, Hiro pulled up his skirt, revealing the baby in the amniotic sac that he was pushing out. There were small patches of blood and discharge covering the sac, and it was dripping with all sorts of other fluids. Tadashi’s eyes widened as he saw the baby that was coming out of his own brother, slowly covering his mouth as he kept on looking down at his stretched out vagina.
“Surprise! We made it ourselves!”