It turned out Louis wasn't a match, and neither was his sister Lottie.
When Louis called her to explain everything that was happening with Matty she cried because, just like it had happened to Louis, all the memories about their mum came back to her. Lottie was Matty's godmother but since the little boy was born she had only been to England three times, but she always sent him presents and Matty knew perfectly well who she was because Lottie was constantly video chatting with them. Lottie wanted to come back to England to be with his brother and nephew, but Louis told her it wasn't necessary, that she didn't need to put her life on hold for him, but he asked her to get tested to see if she was a match, and she did that same day, but she wasn't a match.
So the search for a match in the stem cell donor registry (or whatever it was called) had started, but so far nothing had been found. Liam kept saying they had a lot of time until the transplant needed to be done, and that every day new people signed up in the registry so they shouldn't loose hope. But Louis and Niall were dead set on taking matters into their own hands, they thought it was better to be safe than sorry, and besides, before Matty got sick Louis already wanted another baby, and if that baby could also save Matty, it was even better.
"How did it go?" Niall asked when Louis walked inside Matty's room.
Niall had found out a lab where they did the in vitro fertilization Louis had read about and he had pulled some strings and he had set an appointment for Louis for that afternoon, and Louis was coming back from it.
"It went great" Louis said and walked at Matty's bed and kissed his sleeping son's head.
"Details please" Niall asked as Louis sat on a chair next to him.
"Okay, they said that they definitely do that sort of in vitro fertilization, but let me tell you, it's not cheap, at all" Louis said.
"Lou if you need money..." Niall started.
"Don't worry Ni, I have enough, our business does pretty good" Louis smiled.
"Okay good, but if you ever need money you know you just have to ask and it's yours" Niall said.
"Thanks mate".
"Don't mention it" Niall brushed it off "So what did they say about the whole procedure?".
"All they need is to harvest some of my eggs and I should bring the sperm of the donor" Louis said "The rest is just like we read; they will fertilized the eggs with the sperm and then a couple of days later they will test the zygotes to see if they are a match and then they will implant whatever amount of them that are a match".
"So you're willing to have twins or even triplets?" Niall asked with his eyes wide.
"No, don't be stupid Niall" Louis laughed "They said that in any in vitro fertilization they always implant more that one zygote because only some of them latch or whatever the right word is, sometimes none of them do".
"Oh okay, that sounds reasonable" Niall nodded "So are you definitely doing it?".
"I think so, I made an appointment at the clinic where I got inseminated the first time to get the sperm" Louis shrugged.
"When's that?" Niall wondered.
"Tomorrow afternoon, but don't worry, I asked Eleanor to come stay with Matty while I go" Louis said.
It was Tuesday, and Matty's chemotherapy had started last Friday morning, and so far so good, Matty hadn't had any side effects, but according to Zayn many children didn't get them right away. Louis was always with him when he got the chemo, and every night he slept at the hospital, but he had been going home for a few hours every afternoon to shower and rest a bit, but he always made sure someone stayed with Matty.

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Whatever It Takes ~ larry mpreg au
Fanfiction[FINISHED 2017] Louis Tomlinson always wanted to have children. At the age of 29 and after years of failed relationships he decided he wasn't going to wait for the right person anymore, so he had a baby on his own. But what will happen when that chi...