Not really following timeline. After Season 5B AU.
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It was four months after Derek disappeared with Braeden, four months of missing him. Just a few days ago we defeated the Beast and Theo. Up until then Scott was too busy to realize something was wrong with me. When he asked me a few days ago I just sighed and told him that I missed Derek.
"Hey, buddy, I miss him, too. I'm sure he will come back, when he figures out how to deal with his transformation and after he found Kate." Scott had said. But I knew Scott missed Derek differently. Scott was my best friend, but after the Nogistune things changed. I still had nightmares and panic attacks, but I never told my dad or Scott. One day Derek wanted me to research something, but when he came into my room, he saw me having a panic attack. He hold me in his arms, till I felt better. After that I came to his loft when I couldn't sleep, he had gave me a key before, so sometimes, when he was out and searching for the Benefactor or something like that I came and slept in his bed. I always woke up in the morning to Derek spooning me.
One night when I had a really bad nightmare Derek kissed me and things turned that way. I never told Scott that I lost my virginity to Derek. But then we went to Mexico. We saved Scott, but in that night Derek left me.
Before he went away he put me aside, away from the werewolf ears. He had hold me in his arms and explained why he needed to go. "I'm so sorry, Stiles. But this is huge. I can't go to Beacon Hills, not when Kate is out there. She already killed nearly my whole family and she tried to kill you all. I'm not risking anything. I will find her and kill her. I'm doing this so you can be safe and as soon as I can I will be back, I promise." He had kissed me on the head and wanted to go, but I wouldn't let go of his hand. "I love you, Derek." I said. He had turned around and kissed me one last time. "I love you, too, Stiles. This is not a good bye." That were his last words towards me.
Right now I was hanging over my toilet vomiting. It was the third time today and it was just ten am. It was like this for weeks now. Okay, maybe today was just a bad day. I had at least one bad day every week. A day where I spent the whole time eating, vomiting or sleeping. I was seriously concerned. I was ready vomiting, so I flush the toilet and brush my teeth. Maybe I should go see a doctor. It was Saturday, so dad wasn't home and I didn't need to be at school.
When I was at the hospital, Melissa was the one writing down my symptoms. After she wrote everything down she looked confused. "What it is?" I asked, but she shook her head slightly, then stood up and left the room. After a few minutes she came back with an ultrasound machine.
"Melissa?" I asked warily, but she didn't answer me. She just pulled my shirt up and put some cold cream on my belly. Then she took one part of the machine and kinda scanned my belly, until she stopped. Her eyes were wide in shock. "Melissa? What the hell is it?" I asked desperately. Her eyes left the monitor I couldn't see, because she turned it away from me. "Stiles, you're pregnant in the 18th or 19th week." "What?!" I nearly screamed at her. I did a bit of calculating in my head. That would have been like a few days before we all left to mexico. One or two weeks before Derek left me. Did that Idiot seriously knocked me up? I was a damn dude! How could that even work? All this stuff was going through my head. But one thing overpowered it all. "I want to see my baby." I told Melissa after a few minutes and pointed at the Monitor. "Not Baby, Babies." Melissa corrected and my eyes got even wider. "Twins?" I asked. But Melissa shook her head and while she said "Triplets." , she turned the monitor around and showed me the three little bundles in my belly. If anybody would asked, I would deny it, but in that moment I was so overwhelmed, I might have spilled a few tiny happy tears.
While Melissa cleaned my belly and put the ultrasound machine in a corner she asked. "Stiles, did you slept with a werewolf?" I didn't answer, just stared really intensively at my hands and that was answer enough. "It's Derek, isn't it?" My head shots up and I stared at Melissa. "How ...?" I wanted to asked, but Melissa huffed, like she was offended. "Stiles, who else? The only Werewolves in town 18 or 19 weeks ago were Peter, who is your enemy, Liam, who you treat sometimes like your puppy (Scott told me), Scott, who is your best friend since childhood and I know you will never feel like this for him. That just leaves Derek. And Stiles, honey, I saw how you look at him."
After that I begged Melissa not to tell Scott. Scott stormed into my room the same evening. She had told him, she also had told him that it were Derek's babies, too. I made Scott promise me not to tell Derek. Scott wanted Derek to take responsibility. But I knew that those children were just another reason for Derek to hunt down Kate. He wouldn't risk getting his babies killed and i seriously couldn't take the message that Derek wouldn't come back, so i didn't wanna ask him in the first place.
On Monday Malia hugged me and said she would protect me and the cub.
Lydia asked me many biologically questions and if someone is gonna find out how it is possible for me to be pregnant it will be Lydia.
Liam totally acted like a puppy, he even said he was happy to 'finally get a brother'. We all looked at him confused. "You know who the father is?" I asked, because I thought Liam maybe confused a few things. "Derek ..." He said quietly. Malia then started to laugh and mumbled something about "Stiles is pack mother." I didn't really get it.
Mason bought me baby books and even offered to drive me and get baby stuff. I then told him that it would be triplets. Scott spit out his drink at that. Seems like Melissa hadn't told him that.
A month later and I had swelled up. I begged Dad to let me stay at home and he said yes. Telling my dad about the babies was not like I expected. I thought dad would be mad and give me the safe sex talk again. I also thought he would threaten to shoot Derek. But it was different.
Dad nearly broke down in tears after hearing he would be the grandfather of three werewolves (Deaton had made an ultrasound, while holding wolfsbane at my stomach and so we could see how the babies disliked the plant - so werewolves). He also made plans of me and Derek building a house, because ours would be definitely too small for six people. Dad wanted Derek to move in! I was really confused and Dad didn't stopped. He told me that we could build a new house at the Hale property. He would be ok with me moving out, but he wanted an own room at our house so he could sleep over at any time. Dad offered to watch the babies if Derek and I wanted to have a night out.
That all left me with an open mouth, but now I was sitting in mine and Derek's living room with my Dad and the pack. Today they helped me decorating mine and Derek's room and the one of my dad. Tomorrow we would decorate all the other sleeping rooms. We had a lot of them, because Scott, Liam and Mason thought they could also sleep over when they want to. Mason and Liam would share one if the stay over and Malia and Lydia would also share one. Scott got his own room. They already decided who get which, but I was the one who decided which room would be for the triplets.
I gave Dad a beer and let myself sink on the couch. Dad didn't look happy, mostly because everyone, who knows about my pregnancy, try to spare me any work. So when they help me decorate, it actually means they do all the work and I tell them where to put things. Sometimes I'm allowed to bring them juice or cookies.
A month later I couldn't leave the house, mine and Derek's, I was so big everyone could see with one glance that I wasn't fat and I was in my sixth month now. Three more to go. So it was in the middle of the night and one of my babies had woken me up, because with six month they can kick like hell. At first I thought it just kicked for no reason, but then I could hear it too. My phone was ringing. I didn't even look at the CallerID I just picked up.
"Hello?" I asked with a yawn.
"Hey, Stiles." I nearly let go of my phone.
"Derek?!"
I swear I could hear him smile. "Yes, It's me Stiles. I took Kate down. Now I'm ten minutes away from your house. I know it is in the middle of a school night, but I need to see you, can I?"
I tried to let my voice sound normal. "Sure you can, but I'm not at my father's house. We rebuilt you old house, I'm there with the pack and my dad. Just come here and go upstairs and then the door at the end of the hall, can't miss it."
"Why did you rebuilt my old house?"
"I will explain it when you come here."
"Ok, see you then."
"Yes."
And then I hung up.
After twenty minutes Derek opened the door and closed it after him. Just a second later he was by my side. "I missed you so much." Derek whispered and pressed his lips against mine. Then he pressed his body against mine. Immediately he stopped. He shuffled back and pulled my blanket down so he could see my belly. "Stiles?"
"Ehm ... Surprise. I'm pregnant with our three werewolf-babies." I tried to chuckle a bit, but it sounded weird. Derek just stared at my belly. "That's why you rebuilt the house. To have enough space for ... our family." Derek sounded like he couldn't believe his luck. I reached for his face and made him look in my eyes. "Yes Derek. Soon this house will be full of little paw sounds on the carpet and I guess neither of us is planning on stopping with just three children. We will have a wonderful giant family." Slowly I kissed Derek, just to see him smile. "That sounds good." I gave him a smile too. "Now get rid of the leather jacket and the pants and get in here. I need my sleep." Derek nod and got with me in bed.
Derek's warm arms around made me fall asleep again.