Looks like a Rikuo x Tsurara ending to me! I’m straight with that!!!!
They had their “Umbrella” scene too…this ship has SAILED
If you hadn’t already, read chapter 210.5 (can be found in some places like Batoto, while in others not). That one canonizes the ship more than anything, and the author himself confirms in textual part of the final volume that RikuTsura is canon.