[Nanahara Mitsuru] An Old Man Teaching An Ignorant Girl All About Sex - First Part {Doujins.com}

An ordinary middle-aged man finds his quiet life upended when a curious young student named Hina, wide-eyed and clad in her crisp uniform, arrives at his door insisting on an impromptu lesson from an adult "textbook." What begins as a flustered study session quickly spirals into her determined, hands-on education, leaving the bewildered older man gasping as the eager pupil takes the lead in exploring every sensation. With her innocent face and surprisingly bold curiosity, Hina turns the tables on her reluctant instructor in a steamy, deflowering encounter that promises even more daring escapades in the next chapter.