Help

I know one but i forget the manga's name. If someone can help me out, it had an uke who pretended to be a sadist but was really a masochist and the seme was sadistic. All occurred in workplace setting. (Currently ongoing.)

http://www.mangago.me/read-manga/kichiku_encount/

maybe http://www.mangago.me/read-manga/do_do_do_s_kyuu_kareshi/

hmm... maybe these?
http://www.mangago.me/read-manga/caste_heaven/
the uke wears a vibrator but at school. be careful, it is dark and twisted, and contains rape.

http://www.mangago.me/read-manga/yugami_hajime/
same as above, very dark and twisted.

http://www.mangago.me/read-manga/hitomi_no_giwaku/ it`s the sequel of
http://www.mangago.me/read-manga/hitomi_no_honne/
http://www.mangago.me/read-manga/fudanshi_kun_no_honey_days/ ch.2

but plug to school
http://www.mangago.me/read-manga/kowarekake_no_omocha/

this one, if memory serves right!
http://www.mangago.me/read-manga/love_prism/
Also needs a shout out for some seriously sexy hardcore BDSM ლ(´ڡ`ლ)

http://www.mangago.me/read-manga/giocatore_hokaku_keikaku/
http://www.mangago.me/read-manga/kichiku_megane/