A1) Well if you mean the end of Final Act, they do seem to act like a married couple since they're happily married after they're happily reunited. Even the part when Kagome called Sesshomaru "Big Brother" (which means she's saying that he's now her brother-in-law) which it annoys both Sesshomaru & InuYasha. At the end, InuYasha & Kagome standing at the end of the cliff, watching happily at the area by the sunset, thinking hoping that their future will become more wonderful as they head towards tomorrow. Or for the end of Ep. 167 (last episode of InuYasha Series 1), they do seem to act like a happy married couple but they just don't want anyone to watch them doing something romantically in public.