I will never not laugh at this top panel.
http://www.mangago.zone/read-manga/yoru_to_asa_no_uta/mf/c007/11/
Another yaoi I would recommend to give you the bittersweet feeling of this would be Smells Like Green Spirit. It's probably the first yaoi that I read that made me cry.
http://www.mangago.zone/read-manga/smells_like_green_spirit/
I really wish I had warning going into the last chapter because now I'm beyond pissed and the next volume isn't coming for a while so I have no idea what's next. Like my heart is pounding MAD.