I had no idea you were into Izuseri or Munatotsu! I never thought of the latter but yes, the sparkles and the hobbies are perfect! What if Totsuka picked up puzzling for a while and they met on neutral ground in some sort of puzzle convention or event of some kind? And of course, the exasperated or surprised fallout in their clans when they hit it off and start dating.
Munatotsu is definitely my favorite non-Fushimi related crack ship, I feel like they would just get along so well? Probably too well, to the point that everyone regrets ever letting them meet. Like I could totally imagine them meeting on some neutral ground and developing an unexpected rapport. Maybe Totsuka picks puzzles as his hobby for the week, he buys some neat 3-D ones and starts working on them in the bar and Mikoto is probably extra annoyed because this is giving him Blue King flashbacks. Totsuka's all 'oh, that person like puzzles?' and Kusanagi says that apparently the Blue King is working on them constantly, Awashima complains about it to him fairly often. Mikoto adds that Munakata always does weird puzzles too, like pictures of his subordinates' faces and Totsuka gets a thoughtful look, Kusanagi facepalms like definitely no.
Totsuka finishes up the puzzle he was working on and decides to go buy another, as he's at the store looking around he happens to run into none other than Munakata. Munakata is surprised to find Homra's Totsuka Tatara here of all places and Totsuka mentions that he's really into puzzles right now and does Munakata have any suggestions. Munakata's eyes immediately light up (he's been waiting for years for a random bystander to ask him this okay) and he starts pointing out his favorites, Totsuka mentions that he likes the 3-D ones and soon they're browsing the papercraft aisle together. Totsuka is impressed by Munakata's knowledge of puzzles and maybe they come across one puzzle that reminds Totsuka of another hobby, like oh that one with the tree is like the time I decided to take up horticulture. This has now caught Munakata's interest and soon they're discussing garden plants and advantageous bugs and just having a totally good time.
Eventually Totsuka goes back to Homra but he mentions that he wouldn't mind talking to Munakata again some time and they end up meeting a few days later at a cafe for tea. During their 'date' the two of them discuss various old hobbies of Totsuka's, all of which Munakata asks many questions about with sparkling eyes, as well as some talk of the kinds of bonding activities Homra holds versus what Scepter 4 has done (Munakata is looking for some ideas) and maybe they even get into a little people watching, Munakata deducing various things about people walking by just by looking at them and Totsuka adding in his own thoughts. At some point Munakata mentions that there's like a random festival happening nearby, like it's the annual clam diving competition or something and Totsuka thinks it sounds interesting and they should try it out, Munakata agrees and off they go to have terrible ideas together.
When they actually start dating it probably just makes everyone's heads spin, like they can't imagine how these two of all people ended up together (Mikoto and Fushimi are probably the two with the best idea of just how frightening these two would be as a combo and they both give a heavy sigh when they find out like this is not going to end well for the rest of us). I imagine Munakata being totally up for like joint bonding activities between the clans, while Totsuka will stop at Scepter 4 sometimes and the Blues can always tells when he's there because there are extra sparkles seeping out from underneath Munakata's office door. The more time they spend together the more their respective clans realize that these two really do get along well together and what a terrifying prospect that is. (Also have I mentioned I once wrote Munatotsu? Because I wrote a Munatotsu.)
