i don’t read very many fanfics but i’ll try!!
mother of one - not romantic but it’s super duper cute. the basic plot is human karkat is taking care of lil baby troll nepeta.
herding cats - i haven’t finished this one actually but you should definitely check it out!!
fortunately, for us - and i haven’t actually started this one yet except for the first chapter but i’ve heard lots of good things about it!!
i’m sorry this isn’t a very long list but these are the only ones that come to mind ;w; i hope i helped you find something to read though!!