Sorry I still haven’t arrived at taming Glaurung yet! I need to add this interlude between part two and part three. I felt bad about a less cursed AU in which Nargothrond is still destroyed, so I came up with an alternative, but it changes a lot of things, and I still feel bad because this time the Hadorians are less fortunate, but it’s more satisfying to have Glaurung tamed before he sacks any realm.
An alternate option for Túrin and Niënor to meet as siblings I could think of is an AU in which Túrin returns to Dor-lómin for Morwen and Niënor from Doriath. (Thanks for pointing out Túrin’s open war campaigns in Nargothrond enable Morwen and Niënor to come safely to Doriath and thralls to escape!) Túrin doesn’t run into trouble with Saeros and continues to fight on the marches of Doriath until he can no longer stand the lack of tidings from Dor-lómin and decides to check on his mother and sister, against Thingol and Melian’s counsel, I guess, but this AU is less cursed. However, I struggle with how things go down when Túrin gets to Dor-lómin, because I doubt a rescue mission could go well if he starts a rebellion. If he doesn’t lose his temper and tries to figure out a plan with Morwen, Niënor, Aerin, Sador, and other thralls to avoid large-scale conflict and vengeance from the Easterlings, maybe it could succeed? Though it would be difficult to free many thralls or help them escape without a safe road, so I feel sad about that, but it wouldn’t be a mess?
Morwen and Niënor come to Doriath with Túrin’s aid. Túrin and Niënor have a great bonding time for many years, riding horses, walking in the woods, and learning about plants together. She helps him relax after he has done too much battle. Beleg doesn’t get stabbed by Túrin, and Nellas finds a new friend in Niënor, so the four of them could form a polycule, which Mablung ends up joining. I still doubt Túrin could stay at ease in Doriath for a very long time though. Maybe Túrin is provoked into leaving under different circumstances, and Niënor follows? Morwen has to follow after. Beleg and Mablung have to do their canonical tracking tasks. When they catch up with the siblings, Túrin would rather not go back, and Niënor would rather go back but not without Túrin. Yet peril doesn’t find them outside the Girdle after all, for instead of a malicious dragon they encounter a tamable dragon…
Regardless of which scenario you prefer Túrin and Niënor to bond as siblings, the next part (hopefully the last part) with Glaurung will apply to both.