AUTHOR'S NOTES

I decided to post the crossover of Testament of the New Sister Devil and High School DxD! So, buckle up because it's gonna be a wild and loooong ride.

So first off, I made a pretty detailed plan on the chapters, arc, pairings and what not. And I estimate this being around 100 chapters long… so yeah. That's pretty fricking long.

Second off, rating will be obviously M. And as for lemons, I planned them out too. And there will be a lot of lemons. Like full blown fucking. I counted 60 lemons so… yeah. A lot of fucking. However, there will also be an overarching plot too, with a conclusion.

And I here you asking, who will do all the fucking? Well, of course Basara and Issei. And who will be the girls? Well, if you do not want to know, skip this little part.

ISSEI'S HAREM

Rias, Akeno, Koneko, Asia, Xenovia, Irina, Rossweisse, Ravel, Raynare, Vali (Female), Ingvild, Kuroka, Le Fay, Kunou, Yasaka, Gabriel, Seekvaira, Tiamat, Lilitifa, Bennia and Serafall

- All the girls are from DxD universe

BASARA'S HAREM

Mio, Maria, Yuki, Kurumi, Chisato/Afureia, Zest, Noel, Kalawarner, Mittlet, Sheila, Lucia, Chika, Shijo, Rikka, Brynhildr, Celis, Nanao, Elmenhilde, Valerie, Lavinia, Jeanne

- Kalawarner, Mittlet, Valerie, Jeanne, Elmenhilde and Lavinia are from DxD universe, rest from Testament of New Sister Devil universe

OTHER PAIRINGS

Riser's harem: Yubelluna, Mihae, Karlamine, Siris, Isabela, Xulean, Ile and Nel, Ni and Li, Marion, Burent, Mira, Shuria, (OC to fill in for Ravel)

Sairarog/Kuisha/Corianna/Latia

Jin/Sapphire/Raphaeline

Zeoticus/Venelana/(OCs, I found out Zeoticus has a harem so I may create some characters)

Kiba/Tsubaki

Saji/Sona

Laila/Leonhart

Grafia/Sirzechs

Lars/Lint Aellzen

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I will add more pairings in the future. Maybe. We will see. As for the peerages. I will not spoil that. Only thing I will say, is that they are pretty similar to the ones in the DxD anime. At the beginning you have this with the two main girls.

RIAS'S PEERAGE

KING: Rias Gremory
QUEEN: Akeno Himejima
BISHOP: ?, ?
KNIGHT: Kiba Yuuto, ?
ROOK: Koneko Touji, ?
PAWN: ?, ?, ?, ?, ?, ?, ?, ?

MIO'S PEERAGE

KING: Mio Naruse
QUEEN: Maria Valac
BISHOP: ?, ?
KNIGHT: ?, ?
ROOK: ?, ?
PAWN: ?, ?, ?, ?, ?, ?, ?, ?

Of course, later, Issei and Basara will have their own peerages. But as for now, this is where we will start. I will update this list every now and then, and add peerages of other people.

Anyway, despite there being a lot of similarities in DxD and Testament universes, there are a lot of differences too. I had to merge characters, move characters and as such, so at the end of a chapter, I'll explain what I did with what, so you readers are following the story without confusion.

That is all for the beginning, so now, let us get on to the first chapter of The Twins!