Haruka’s Miscalculation. (Pixiv:June 30, 2014) (Patreon)

    Haruka has long had a desire to treat her best friend Yu like a baby.  So she set up a contest based on overall scores on an academic achievement test.  Haruka, with her high academic ability, should be able to win with a comfortable margin, but the result was...

    Through this one incident, Haruka discovered the joy of being a baby, the pleasure of soiling her diaper with pee, and the happiness of being pampered.

Since there are more than 10 images this time, I've attached a zip file to save them.