Period drama: coy middle aged woman overturns her obvious conventional spinster persona and turns into an erotic nymph

A quiet woman in her late forties meets a young man and instead of an old lady, he gets provocative and seducing. Her freshness is an added advancement to his skills to make him perform more fascinating. From the naïve, exquisite teenage girl to the sultry and sex appeal mature mother, this old and young sexual adventure is unique.