a really cute trio but im not a fan of snsn + other member in a romantic way! i can get behind it if we’re talking about jungwon tagging along in sunsun’s dates like a third wheel or smth, like sunghoon jokingly saying now them (sunsun) adopted a cat (jungwon) and take him everywhere like they’re the parents of their kitty shshhs. honestly that would be so cute, but in general i like trios involving sunsun just not romantically with them :-)

taking what you said about sunghoon treating jungwon like a cat and meowing at him, it would be so cute that sunoo wakes up early but he doesnt see sunghoon in the bed anymore, so he gets up to look for him and founds him in the kitchen, cooking.

“baby, what are you doing up so early? and cooking?” sunoo asks.

“the cat was hungry, i had to make him breakfast” then sunoo realizes a sleepy jungwon is sitting on the table, waiting for sunghoon to finish cooking.

sunoo just stares in disbelief at them and goes back to bed, thinking that sunghoon is taking a little too far the cat agenda he has on jungwon… making him a little weirded out, but sunghoon has the habit to treat the members like the animals they resemble. he sometimes treats jake like a dog, riki like a duck some days and other days like a puma, jay like a cat too and sunoo is not left behind either, treating him like a fox or a cat too.
some time later, he feels sunghoon laying in bed again and cuddling him.

“i fed the cat, hes eating again until afternoon” sunghoon mumbles before falling asleep.

his boyfriend might be a little weird sometimes but sunoo still loves him regardless.