30K years and you still haven't made a move. This is the hardest thing to swallow from this manga.
A man and a woman that love each other and have been together for 30K years without doing it? More unrealistic than magic, now that is science fiction.
Big numbers in years have always been kind of... pointless in manga, but I feel this trend has become worse in recent years. Of course, they're fictional stories, so it's like, who cares lol, and the writing quality of this is mediocre in general, but I feel it seriously cheapens the story even further.
I might sound like an oldfag, buy my favorite applications of this are in older time travel stories, where the accumulation of years in experiences over time had profound effects on characters' development and the story's emotional depth., like in Madoka Magica where we see Homura's struggles and how she reached past the breaking point, or in Haruhi, with Nagato and the entire Disappearance of Suzumiya Haruhi storyline. (Of course, these are vastly different stories, but I mean in the sense of how they use the passage of time)
But nowadays, this device is often employed as a shallow justification for a character's overpowering abilities without meaningful character development.