Responses
http://www.mangago.zone/read-manga/mob_for_jack/
http://www.mangago.zone/read-manga/gamushara_mob_rape_2_chikan_jigoku_hen_kuroko_no_basuke_dj/
There's quite a lot of gang rape on myreadingmanga, you can check that out
I also found a tag! http://www.mangago.zone/tag/gang+rape/
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