aviekokyre: cyrus has full watson brainworms he thinks mycroft is the smartest dude in the world even though he has his annoying guy in his 20s moments
anyway i think for yujin, staying in london was a combination of guilt, obligation, and sunk cost fallacy - and then ofc him being so attached to sholmes
he wanted to go back for susato but felt so guilty for having left in the first place that he was beating himself over whether he even deserved to come home while, at the same time, knowing he NEEDED to go home again at some point
then when you get into the obligation/sunk cost fallacy it's like oh well i already wasted all these precious years of my child's life i have to make what i sacrificed worth it. while also not going back until the government shipped him back
i think ximi yujin was cool with it bc he had a long time to think about it but fresh from canon yujin is running in the other direction to not confront that he has probably been in love with sholmes for like 10+ years