self insert as a male version of Rias

rules of challenge

must have the power of Destruction

can choose one other special ability across the Multiverse except God tier abilities

second rule must have a huge harem

girls in Harem list Akeno Himejima Koneko Toujou Asia Argento Xenovia Quarta Rossweisse Ravel Phenex Sona Sitri and female members of her peerage Kuroka Le Fay Pendragon Serafall Leviathan Seekvaira Agares Lady Phenex Cleria Belial (does not fall in love with Exorcist so she does not die in the story)
Grayfia Lucifuge all the females in Riser Phoenix peerage Lavinia Reni Raynare Kalawarner Mittelt Gabriel Griselda Quarta Irina Shidou Ophis Tiamat Katerea Leviathan Jeanne d arc Kunou Yasaka Valerie Tepes Elmenhilde Karnstein Venelana Gremory lady sitri Murayama Katase Aika Kiriyuu issei's mother (parents got divorced she claim custody of her child) Momo Momozono Kiyome Abe Penemue.

now the gender-bent members of the harem Yumi Kiba (fem Yuuto Kiba) Gasper Vladi (fem) izumi Hyoudou (fem Issei Hyoudou) velena Lucifer (fem Vali Lucifer)
Artorias Pendragon (fem Arthur Pendragon) Serena Lucifer (fem Sirzechs Lucifer) Melody Gremory (fem Millicas Gremory)

Story summary your self insert character died and is reborn in the DxD verse as a male version of Rias realizing that you are taking Rias place you quickly realize this universe is the same as Canon but also slightly different where Riser Phoenix doesn't exist and his sister Ravel Phenex who is slightly older than her Cannon self has his peerage instead and your happy that you're engaged to her you also notice that Katerea Leviathan is serafall Queen and did not join the old Satan faction how the story progresses is up to you I suck at summaries by the way

rules that are permanently must happen no matter what in the story. 1 Valerie tepes must be saved along with Gasper but does not join your peerage but she becomes your ally 2 do not let Izumi or Asia die by raynare so don't be a dick and don't always follow Canon like an ass hole 3 and last but not least you must always try to balance the fight scene with the romance scenes no half-assing either.

lemons are optional