I mean yeah evetually if they wanted monogamous relationsip but I just think it's lazy writing for the top just to quit his job without discussion with his partner and without back up plan.. but as I said, with short stories a lot of things happen in the background.. really good stories are always too short
Yamato was still a college student so he had the luxury of just quitting on the spot. From the sound of it he also had a new part time job lined up before he quit seeing as he immediately followed up with that news.
He's also an only child so his parents could probably afford to help support him through school.
Hiroya had also voiced that he didn't want Yamato having sex with anyone else. I feel like that's a pretty reasonable reason to quit doing sex work ASAP.
It always feels grimy to me when they either tell their partner to wait for them to get too old for SW or make up some other stupid excuse as to keep having sex for money.

Its good short story, and as such oesnt delve much into things. For some reason Im little upset about Take/Yamato quitting his job just like that. I know because its short it had to happen abrubtly and to keep it cute but.. I dunno.. maybe I just enjoy when there is little bit more adult communication?