Oshikko Sensei by Ogu — Ongoing

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Oshikko, a nurse in an elementary school, takes care of student's stomach, bladder, and/or vaginal problems through the power of urethral insertion and liquid pumping.

Chapter 1 released Jul 7 '12
Chapter 2 released Aug 12 '12
Chapter 3 released Sep 3 '12 Anal Fisting
Chapter 4 released May 20 '13 Tomboy
Chapter 5 released Oct 27 '14 Anal Fisting Reversal Tomboy