Kuchiutsusu

Yuka, writer of platonic romances, is asked to write an erotic love story. Nursing a broken arm, she ends up accepting the help of a transcriptionist in the form of her dentist, Mr. Hasegawa. Describing the desires of the flesh isn't exactly Yuka's forte, but led by Mr. Hasegawa’s guiding hand, the words begin flowing out of her. Alone with him, Yuka bares all! An invigorating and sensual love story!

(Source: Kodansha USA)