Shinyuu to Kodzukuri Suru Koto ni Narimashita.

Hanataro, the young president of a large company, is eagerly awaited by those around him to become heir to the company, but he has neither the desire nor the time to get married. Then, "Shall I have the baby?" Kaname, his secretary and best friend, makes the proposal! Kaname immediately begins her fertility quest, using a drug popularised to combat the declining birth rate, "a drug that can make men pregnant". However, the side effects of the drug cause a tingling sensation in his groin that won't stop...?+