Fallen Shinji

Description
Shinji has fallen down and can't get up. In an alternate route of fate/staynight, Gilgamesh falls in love with Sakura Matou after becoming Shinji's servant. After Sakura refuses to stop going to Emiya Shirou's house, Shinji tries to have sex with her, but after he is rejected by Sakura who has become a second Holy Grail unwillingly, Shinji goes insane. In his mad lust he attacks Sakura who quickly pushes him back and injures him using the power of the Holy Grail with the souls of 3 servants. Shinji in frustration calls Sakura a good for nothing nest of worms. Sakura breaks down after hearing this and lashes out destroying parts of the Matou mansion. Gilgamesh who has been watching this scene saves Shinji and knocks out Sakura. Gilgamesh who was watching the horrifying things that were being done to the one he loves by Shinji and Matou Zouken decides to protect her by eliminating them. With the help of Kirei Kotomine and a magical relic from the Church, Gilgamesh destroys Zouken using his chains that were enhanced by Kirei. He then extracts the worms and Holy Grail contents with Kirei from Sakura's unconscious body and plans a twisted revenge. He kidnaps Shinji and implants the mutated worms filled with magical energy from the Holy Grail into his stomach. He proceeds to mock him by calling him a nest of worms. Shinji transforms into a giant mass of flesh as a psuedo-Holy Grail laying eggs with worms which Shirou says are strangely like servants. Sakura wakes up in a wedding dress next to Gilgamesh who has built them a garden for their ceremony using his numerous noble phantasms, and at the center of this garden is an ugly creature of rotting flesh with worms coming out of its various orifices. When Gilgamesh reveals to Sakura that the creature is her brother in an attempt to make her happy, she runs into the creature crying "Nii-san". Gilgamesh tries to stop her but she rushes to him only to get squashed. Gilgamesh in a fit of rage destroys all of Ryuudou Temple and most of Shinji before killing himself.