Nande Koko ni Sensei ga!?
Why the Hell Are You Here, Teacher!?

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If rito is one guy that ends up in many happenings with different girls Nande Koko ni Sensei ga!? is a bout a student and teacher (a new one each volume) in even worst(wink) happenings that rito TLRD and sensei ga both have stories that only advance because of the perverted situations the protagonist fall and have great service and lots of waifus 

Stalkers is a manga in the same style, in which there are several stories in the same city; every 1 or 2 chapters, they change between MCs 

Both are highly ecchi rom coms involving a male high school student and a lewd female high school teacher. Tho Boku No Kanojo-sensei is more of harem whereas Nande Koko Ni Sensei Ga is more of gags between teacher and student. 

Both series with ecchi situations / releationships between females teachers and male students 

Romance between an older woman and a younger man. ROMANCE 

Romance between and female teacher and a male student. ROMANCE 

An older female teacher sexually toying with a male student. TOYING 

The story is similar Hajimete no gal or Minamoto-kun monogatari but still different. I really like this one. Would definitely recommend