Any yoai manga with the uke getting imprisoned and raped everytime they meet.

http://www.mangago.zone/read-manga/gintama_dj_mienai_kusari/

Not imprisonment exactly, but the uke gets raped a lot in this one: http://www.mangago.zone/read-manga/ao_no_exorcist_dj_fill_kill_reverse_my_moment/

http://www.mangago.zone/read-manga/tatoe_toraware_no_koi_demo/
http://www.mangago.zone/read-manga/prisoner_kaen/
http://www.mangago.zone/read-manga/okane_ga_nai/
http://www.mangago.zone/read-manga/aigan_shounen/
http://www.mangago.zone/read-manga/zion_no_koeda/
http://www.mangago.zone/read-manga/gochisousama/tr/93434/page/154/
http://www.mangago.zone/read-manga/berserk_dj_living_in_sin/
http://www.mangago.zone/read-manga/saihate_no_kimi_e/
http://www.mangago.zone/read-manga/sono_kuchibiru_ni_yoru_no_tsuyu/ (not really locked up)
http://www.mangago.zone/read-manga/black_sun/
http://www.mangago.zone/read-manga/garasu_no_suna/
http://www.mangago.zone/read-manga/honoo_no_suna/
http://www.mangago.zone/read-manga/retsujou_no_meikyou/
http://www.mangago.zone/read-manga/anxiety_of_soul/
http://www.mangago.zone/read-manga/kekkon_zenya/

http://www.mangago.zone/home/mangalist/57857/
Try the ones noted as rape, confinement.

You can trey this dj
http://www.mangago.zone/read-manga/gamushara_mob_rape_2_chikan_jigoku_hen_kuroko_no_basuke_dj/

wtf...this is scary...