Got a fresh ask from Ao3 after I reopened my asks for ukryu or Tsukasa content, and I decided to go for some simple, easy headcanons this time around, just to shake things up <3
Ryusui is still not that much of a fan of monogomy.
His parents had issues with cheating and an all around rocky marriage, so if he dates, he makes it very clear that he doesn't expect to be locked in and exclusive. He isn't a fan of his partner running rampant, but so long as you ask, he'd let you mess around with others.
Ukyo meanwhile is generally more calm in his relationships.
He looks more monogamous than Ryusui, but he's still very flexible and adjustable to healthy dynamics. That's why he's okay with Ryusui being a hoe.
Together though, these two make a wonderful team.
In a couple sense, they work well together because Ryusui can take charge and make decisions, while Ukyo can be the voice of reason when his partner's greed gets ahead of him. Not to mention their energies balance out pretty nicely, with Ukyo encouraging the blonde to relax and be less loud, and Ryusui encouraging Ukyo to socialize.
Though that doesn't mean Ryusui is constantly loud. He's well aware of Ukyo's hearing sensitivity, so he will curb his own volume or even use sign language to make sure he doesn't hurt his partner.
Ukyo meanwhile doesn't force the blonde to entirely give up his greedy, energetic ways, he grows to enjoy the outings he's drug out on sometimes. He simply encourages him to enjoy quieter moments too.
Even outside of a relationship setting, they work very well together to run the Perseus smoothly.
All around, these two work pretty well together, and would be a cute couple and pretty healthy.