[Yosutebito na Mangakaki (Tomoki Tomonori)] Tsukasa-chan's Evil Plan to Make You Fuck a Bunch of Women in Heat (Touhou Project) [Aishi Niichi]

Tsukasa Kudamaki, a sly fox girl with a fluffy tail, runs her wicked scheme by escorting an ordinary man through an endless harem of youkai women in heat, each numbered conquest—Mystia, Mike, Kogasa, and beyond—mounted and filled in a blur of ahegao-faced, cervix-penetrating sessions. As the tally climbs past fifteen girls, he realizes every female youkai he meets is already dripping for him, and even the scheming fox herself finally loses control, kissing him desperately and begging him to cum inside. The closing pages tease the real trap: the man notices strange changes in his own body, hinting Tsukasa's plan was never just about sharing a harem.