Sensei to Watashi (MINASE Ai) Story
From Manga Abyss :
Yoshino Haruka, 16 years old, substitutes for her sister at an arranged meeting and ends up falling in love with Kunihiro-san... To discover the day after that he is her new home room teacher ! How are the two of them going to deal with this forbidden relationship ?
This is the best place to read Sensei to Watashi (MINASE Ai) online.
And here are the reasons why.
Q: Is this the official site for Sensei to Watashi (MINASE Ai)?
A: No, The entire site is fan-made.