Katesai no Tomato Batake -Seieki Saibai-

A young girl named Kate Sai was spending her summer with her uncle, helping to cultivate crops. She was such a novice in so many ways... but would soon learn everything under the big, blue sky...

"Oh god oh god oh god--"

"Yes, that's your clitoris. It's a very special place on girls that feels good. Say it."

"C..clitoris... uhhnnn! ahahh!"

[From DLsite English]