
It's long but an amazing read. The circumstance is different though. For example, the story starts with them separated after a fight. We slowly learn what happens until we reach present time. http://www.mangago.zone/read-manga/dark_heaven/
For slow burns where we watch them discover feelings and see their relationship grow, try Blue Sky Complex. It's four volumes so it's not exactly a webcomic with 80 chapters.
http://www.mangago.zone/read-manga/blue_sky_complex/
It's been a while since I've read it so I'm not sure if it was a slow burn or not, but it's interesting. It has 76 chapters. The main story is done, just waiting for the end of the side story.
http://www.mangago.zone/read-manga/wolf_in_the_house/?av=1

http://www.mangago.zone/read-manga/here_u_are/
the slowest burn u'll ever read

-my starry sky
-someone else
-for your love
-here u are
-guang xiang
Is anyone able to reccomend any long, but well worth the wait, slowburns? Something like "Work, Fight, and Love," maybe? Shouen Ai/Yaoi. Really just want something to last the week. All input is appreciated!