uke gets injured while protecting seme:
http://www.mangago.zone/read-manga/kiss_ja_tomaranai/ (happens in last ch.)
http://www.mangago.zone/read-manga/shihaisuru_yubisaki/mf/v01/c005/4/
http://www.mangago.zone/read-manga/joushi_no_okiniiri/ms/online_manga/6849-1.html/144/
http://www.mangago.zone/read-manga/yami_ni_tooboe_mune_ni_toge/
http://www.mangago.zone/read-manga/dokunoaji/
4th guard you've read I assume
http://www.mangago.zone/read-manga/tenshi_no_tame_no_shohousen/
Uke ( who is an angel) gives his life force and loses his wings
you can try this one too - the uke gets injured protecting seme in the ch. next to the one in the link (ch. 19 is the starting point of the story)
http://www.mangago.zone/read-manga/ai_to_yokubou_wa_gakuen_de/mf/v04/c019/
hi. anyone know any manga where the uke sacrifices himself for the seme? like aiso tsukashi