as a distraction and also b/c the idea was circling my mind earlier, but have you ever considered babytraping royed?
I think about babytrapping with literally every single ship ever, anon. But royed babytrapping is good.
(This is written with Ed being the one able to get pregnant and Roy doing the trapping because that's my preference, sorry if you wanted something else, anon!)
I think the idea would've first formed nearing the end of the main story, when Bradley's fall is in sight and there's hope for some kind of future on the horizon. It's not a strong hope, but it's all they have. Roy and Ed are together at this point, have been for a while (maybe longer than they should've been), and the closer they get to the end, the more Roy feels like their relationship is on a time limit. The only reason Ed is with him is because of the military, the revolution, his work to restore Al's body. When Alphonse is restored, shen Bradley is gone, when Ed has his pick of jobs and life paths, what would keep him with Roy? Ed could go back to Resembool with Winry, accept Ling's offer to go to Xing and become one of his concubines, or any number of things that would take him farther and farther away from Roy.
The baby trapping is a natural progression of this, though obviously Roy waits until things are settled down.
This. . . isn't as hard as it should be tbh. I was thinking about birth control tampering and all that, but FMA is mainly based off of the 30s and 40s and birth control pills wouldn't become a thing for a while longer. Ed is very educated though and on top of his own research and studying biology, he's also received The Talk from multiple people (first from Izumi and Sig, then Pinako, then a weird mish mash of attempts from random military officers). He knows how babies are made, he knows what contraceptives are, so he's sure to make Roy wear condoms.
Usually.
Most of the time.
Letting Roy hit it raw once in a while isn't gonna do any harm, right? Especially since he's usually pretty good about pulling out. It's fine.
(Maybe some of his information and knowledge about sex is coming from Roy. Maybe some of it is coming from Madame Christmas and her employees, who all love Roy and would very much like to see him happy and settled down.)
Either way, when things are settled down a bit and Ed is too focused on Al's recovery to give in to his own wanderlust, you KNOW Roy is poking holes in all their condoms, talking to his contacts about ways to increase fertility, even just taking the condom off in the middle of sex. Ed doesn't notice as long as Roy eats him out afterwards and the fact that he's staying at Roy's while Al is in the hospital means that Roy has a lot of opportunities to try knocking him up.
By the time Al is released from rehab and can move in with them to continue his recovery, Ed is a few months pregnant and engaged with no fucking idea how either of those things happened while Roy is just pleased as fucking punch and already planning for their next baby. It'll be harder, with Ed being more vigilant about protection and still wanting to travel, but Roy is up to the task :)









