I'm Engaged to my Omega Teacher and it's Killing me! Manga

Alpha no JK Dakedo Fiance ga Omega no Sensei de Asoko ga Taihendesu ; Alpha no JK Dakedo Konyakusha ga Omega no Sensei de Asoko ga Taihendesu ; α no JK Dakedo Fiance ga Ω no Sensei de Asoko ga Taihendesu ; αのJKだけど婚約者がΩの先生でアソコが大変