"Are you sure, you don't want to pounce on me?"

My name is Takashi Miura, and I'm tutoring a high school girl named Natsume Aonami, who is the daughter of a female family acquaintance. I knew her since she was 5 years old, and we often played together back in the day. Ever since Natsume got into high school, I started helping her with her studies, and our student-tutor relationship was good.

There was that time when Natsume asked me to take her to a summer festival if she scored above-average marks on math, her weak subject. What greeted me at the festival grounds was the strangely erotic sight of her in a yukata. My lower half was, no matter what we did, reacting to the view of her grown-up womanly body.

'No... this is no good, I can't possibly lay a hand on my student...'
Natsume then revealed an unexpected side of her to the me who was desperately trying to hold back...

(Source: DMM)

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[Note: This has 2 near-identical versions, one is a heavily censored softcore version and the hardcore version marked R-18 has mosaics. The covers are slightly different, but the story is the same.]