Onna no Ko Hajimemashita.

Hayase Katsuki wakes up after a dream about having sex with a woman, only to discover that the girl from his dream is standing right there. To his shock, he realizes that he has transformed into a girl and merged with Shelly, a succubus. Now, Katsuki-chan must gather energy from men to replenish Shelly's magical power as her vessel. [Translated from [url=https://www.dlsite.com/maniax/work/=/product_id/RJ110585.html]DLsite[/url]]