Because his personality is internalised homophobia, today’s chapter is progress. For us the readers the story is going on for decades but in the couple’s timeline they have been roughly together properly for 4 years. This is progress, he thinks of him as family, but since marriage and other legal things are not possible he doesn’t want to even think that route. And Morigana has to express properly that he wants Senpai to stop being so off putting about their relationship, most of the time he reacts to all his stress with Souichi by sex and talk. This is Souichi’s first relationship, Morigana has to talk man, if you don’t express how will your partner know?

Seeeeee I told you all Senpai thinks they are “already married”. Me on my delusional path like piper of Hamlin….