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So we all know the AU where Sirius and Remus raise Harry, but I have a new suggestion. What if, after Alice and Frank are tortured to the point of insanity and James and Lily are murdered, Sirius and Remus take both Harry and Neville in.
Imagine Harry and Neville being raised as brothers with a solid support network. Imagine both of them having childhoods free of neglect and abuse and expectations. Them being raised with stories of their parents and a household full of love and kindness. Them getting to stay up at night, hiding out under the blankets with a flashlight to giggle about nothing. Them stealing cookie dough and bits of food while Sirius and Remus cook, making a competition out of it. Them going off to Hogwarts together, being sorted together, and having sleepovers in the same fourposter.
Then imagine little Teddy Lupin being born, probably when they’re still relatively young, maybe seven or eight. Them getting so excited, getting in Sirius and Remus’ bed to poke Remus’ stomach and talk to their baby sibling (and sometimes poke Sirius’ stomach just because they can). Them taking it upon themselves to teach Teddy new words and then turning it into a challenge to see who can teach them more. Them rushing Sirius to get them home from Hogwarts quicker every break so they can say hi to their little sibling. Them regaling Teddy with tales of the castle (some of which are more made up than others just to fuck with them) together.
Imagine their family being Sirius, Remus, Neville, Harry, and Teddy, living together and being happy. They all get a happy ending. They get to be safe and surrounded by love. Just… imagine.