Responses
Not sure if this is it, but this manga came closest to mind:
https://www.mangago.zone/read-manga/life_senjou_no_bokura/
Omg thank you ╥﹏╥
Yes thank you ╥﹏╥
So it was about two guys who fall in love and long story short they end up growing old together. One of them dies first, I believe it was the seme and he leaves a testament/will I think. Anyways after some time the uke dies too and both of them get to see each other in heaven?!
I remember crying reading the last chapter. Please comment if you know the title (=・ω・=)