i think the headcanon im going with now is that couch sex happened and through more carcass metaphors and patriarch misery majima keeps returning to sky finance after that, and eventually the post-sex stops being complete weird silence which does take a good few tries admittedly, even if they never talk about anything that matters. it's like, oh did you hear about that new movie, or have you ever tried that restaurant, and whatever. it's casual and meaningless and momentary and that's doable. it makes things a little less miserable for a while. until y4 of course when akiyama learns about majima's baggage and now they Can't go back to just, meaningless sex, because things are too serious, and have you talked to saejima about this? maybe you should talk to saejima about this before you come back. and majima never talks to saejima about it and now things are just kind of worse than when they started, kind of, and maybe he should throw the carcass back into the ocean and kill all wants and needs and desires forever, for good this time