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Background
Tet is childhood friend with Rias and Sona as Tet is adopted by the Sitri Family (I just want it because I have seen some where Gremory adopted the Reader so I kinda want Sitri) because Tet family and the Sitri Family are close friends almost like brothers.
Tet Family died in a car accident when he was 6 as then Mr.Sitri adopted Tet into the Sitri family after that Tet had gain a fiction card ability system where he can turn into female fiction character even from DXD.
The Sitri was surprise as this as they thought it was a sacred gear but Tet said no because he does have a sacred gear in him, he told them it just appear one day. Few days later he met Rias Gremory and became friends with Sona Sitri. Serafall have a brocon on Tet as every time he see him, she would not let him go and want him to transform into a Illyasviel von Einzbern (Magical Girl mode)
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When Serafall first saw this she thought of Tet as his soulmate as they play Magical Girl together.
Everything goes as it is in the anime but Issei in his world is a bastard that abuse the Rias Peerage. When Tet notice this he kill Issei as he extract Ddraig and give her a body and ask her if she want to join Rias Peerage and be a family together.
Ddraig Thought for a bit and said yes as he became the member of the peerage. Same thing happen to Albion as she was treated like a tool by Vali so he extract Albion from it and gave her a body too. Ddraig and Albion became good friends after that.
Few months later the Threat Tyrant 666/Trihexa came and destroy the supernatural world as they fought Trihexa. They manage to win but only Tet, Ddraig and Albion are left.
Eventually a portal appear and suck them in leading to another timeline. Ddraig and Albion go inside of Tet (They can go inside Tet or have their own body as Tet created them a ability to go inside him or to make a body.
