Can you share any fujiope headcanons?
I believe that the two of them have some things in common. After all, they both have a love for performing. They like to put on shows for others to see and often work together for some of these performances. Fuji and Opera both have a career event that features the other and both events are for performances.
While Opera is annoyed at Fuji for calling her "a bad pony" when she breaks curfew, she doesn't dislike her. She instead wants to prove herself to her and outshine her. Of course this would lead the two of them doing lots of performances together.
This is entertaining for the umamusume around them because they get to see more performances! Even if some are strange. No one really questions it. Of course, since Fuji and Opera are doing performances together, they spend a lot of time together. That doesn't seem strange to the other umas around them.
But due to them constantly doing performances together, others just assume they are acting when they start actually dating. It comes as a shock for everyone around them when they reveal that they are dating, and that also makes everyone question when it had started. Not even Fuji and Opera would be able to provide a clear answer since they may both go into dramatics over it. But everyone is happy for them at least.
Unfortunately, now that it is public knowledge that they are dating, they may or may not be a little more annoying with their performances. No one really comments on it. After all, it is their choice. As long as Fuji and Opera are happy with it, it should all be fine.
If and when they decide to get married, Fuji is the one to propose first. But they would both have a proposal planned. Opera would try to outdo Fuji, but Fuji will find a way to outdo her. It may or may not go on for awhile. This is definitely annoying for other umas to have to deal with, but they tolerate it. As long as they are happy.