I had a post-apocalyptic adventure idea some time ago, the main driving force of the story being that it's all an act of romance.. there's a nice handful of chapters that could go into making the story, but lately I've been wanting to tone it down considerably by making it a one-shot.
And then there was another that could technically go on forever as it's based on a neverending time loop. Essentially, I wanna go wild with the action, but have tragic undertones to the story. There's countless ideas that could go into it in terms of doing different things within the repeating loop, but I wanna keep it limited to going through it only once so it feels like the events are locked in, no matter what.