Try these ~
http://www.mangago.me/read-manga/i_m_no_match_for_him/
http://www.mangago.me/read-manga/pink_to_mameshiba/
http://www.mangago.me/read-manga/kakugo_wo_kimete/
http://www.mangago.me/read-manga/koi_ni_nare/
http://www.mangago.me/read-manga/sensei_punch/
http://www.mangago.me/read-manga/ayashi_no_hakoniwa_ni_ukabu_tsuki/
http://www.mangago.me/read-manga/kitsu_ka_nu_shisen/
http://www.mangago.me/read-manga/kyou_mo_ashita_mo_asatte_mo/
http://www.mangago.me/read-manga/karisuma_av_danyuu_no_ore_ga_omocha_nanka_de_iku_wakenai/
http://www.mangago.me/read-manga/sensei_wa_sonna_koto_oshietenai/
http://www.mangago.me/read-manga/zantei_boyfriend/
http://www.mangago.me/read-manga/hitorijime_my_hero/
http://www.mangago.me/read-manga/devils_honey/
http://www.mangago.me/read-manga/crash_into_me/
Any yaoi/shounen ai wheflre the seme is teacher and the uke is student?