Title (C83) [Katou Fuguo] Kaenbyou Furious Mating Season (Touhou Project)
JPN Title: (C83) [全裸屋敷] 東方異種姦合同 (東方Project)
I was commissioned to scan this short story from my own personal copy of Touhou Ishu Kan Goudou by LWB. I guess this will be my first guro/necrophiliarelated upload.

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Doujinshi DB
Toranoana

You can view/download the translated doujinshi here
EXHentai
LWB