I recommend this one. Though the art is a bit classic, the plot is magnificent. http://www.mangago.me/read-manga/zankoku_na_kami_ga_shihai_suru/
http://www.mangago.me/read-manga/koukyuu_no_arika/ sexually abused by his stepfather and traumatized
http://www.mangago.me/read-manga/iberiko_buta_to_koi_to_tsubaki/ uke from the couple in second vol.
http://www.mangago.me/read-manga/hogu_hagyeongsu/
Limiter
http://www.mangago.me/read-manga/oyasuminasai_no_ato_wa/ the alpha seme who raped an omega had a trauma or smth like that.
looking for trauma yaoi/shounen ai manga...if its can i want rape trauma