Looking for yaoi were both of them are doujin artists and I remember there was a part where the bottom pushed the top away cause he thinks that he would ruin the tops future or smt like that
Not sure but maybe http://www.mangago.me/read-manga/jikyuu_jisoku_de_nani_ga_warui/

I read this bl manga (oneshot probably) and I can only remember the ending where both of them die and meet in heaven and when they hugged they became a plane (???) I also remember one of them reading a book called "100 date spots in heaven" but it might be wrong tho
http://www.mangago.me/read-manga/life_senjou_no_bokura/
THANK YOU SO MUCH