Sue,
I just found this story and read through all 6 parts in one sitting. I am in awe!
A major requirement for me when reading fanfic is that the protagonists be in character, which is one of the reasons I always jump at a Sue S. fic. And this current fic does not disappoint. Not only does Plark act and sound as I would expect Clark to, he acts and sounds as I would expect second season Clark to. Ditto for Plois, Flark, and Flois - all in character for the season they represent. Which is pretty cool when you think about it, and certainly makes the story that much more enjoyable.
While I was reading, it never once occurred to me that it might be a form of adultery to be with your past/future spouse. I asked my husband his thoughts on this. ("Honey, if time travel existed, and the you of 1995 came to the present, and I slept with you, would the current you be jealous?" "Wh..what?") Anyway, he agreed with me. That said, I do understand the part about their past selves not being married yet, so I guess you could argue either way on this one.
Looking forward to part 7.