Why in all these BL mangas the seme is so against of bottoming? In real life many gay couples switch.
I'm not referring to that part but this (pages 16 & 17).
https://www.mangago.zone/read-manga/therapy_game_restart/mi/br_chapter-202995/pg-21/
Although it's not the case here (he's relieved though), it's common for the seme to refuse and even take offense if he's suggested to bottoming. I guess BL authors think that making semes the receivers makes them less manly.
It looks like a light comedy story at first but the more you read, it turns out to be more complex. I liked it but I feel like there are still things left to say (parents situation, friends and the curse) and I found the ending very sad. The story is tragic although it is not labeled as such.