Reisen is under a lot of pressure at work, but what choice does she have? Without a job, she doesn't have a visa. And without a visa, she'd have to leave Gensokyo and go back to the Moon. Youmu, hoping to help her dear but obstinate Reisen, hatches an ingenious plan that involves marriage, lies and deception! But is it really lies and deception, or just an illusion? And is this marriage really an illusion, or something else?
Source:
http://www.houseofsixten.com/hcstaff/?p=3502
http://www.pixiv.net/member_illust.php?mode=medium&illust_id=41211627
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http://www.doujinpress.com/products/161510~use-your-illusion-youmu-reisen-touhou/