"What if" Issei Hyoudou was transported to the Warhammer 40k universe and experimented on. Furthermore I got help from chatgpt, there "might" be some rights and wrongs within the storyline due to either who's who or what a person's status is (think of the chess pieces as a reference either with a chess piece inside of them or not) and there might be some rights or wrongs about religion and/or place's but I've gathered it by chatgpt Furthermore, he's not a pervert in this "What if" story

Hyoudou Issei should have died the night he was betrayed. Instead, he awakens as a Shared Piece Devil, bound to three masters-Rias Gremory, Sona Sitri, and Sairaorg Bael(Valeria Bael)-and wielding a Sacred Gear that should not exist. Absolute Causation is not power or magic. It is a law. Every meaningful action creates an unavoidable effect, converted into Causation Points beyond mana, fate, or divine control. With the Boosted Gear awakening alongside it, Issei enters a world of Rating Games, devil politics, and supernatural wars-where strength can be challenged, fate can be resisted, but causation always collects its due.

What if issei had gotten a RPG system after he was reincarnated as a devil. How would it affect him and more importantly the story and others.

"So this is what my fate is. Abused and betrayed, huh?" Those were the last words of Issei Hyoudou. Before he was stabbed by Raynare. The usual timeline. With a massive twist of him being abused due to his lack of magic power. However, when he was revived, he was able to be revived, by an unknown factor known as the System. He was tired of everything and was done being nice and kind to others. Deciding to abandon that completely, he decided to become how the clan views him to be. His ruthlessness, callousness and coldness is displayed, as he doesn't care on them, and only values those that have him by his side. His system, now coming to assist him garnered him access to powers and God like Servants who are fanatically and devotionally loyal to him. His powers, made him a target, but no one is safe from his manipulation, no one is safe from his words, for he shall be building a world of loyal beings around him. High School DXD belongs to Icihei Ishibumi

"Not all god-given talents are meant to be polished." I knew that better than anyone. Some talents-and the desires they awaken-don't have a place in this world. So, I, Hyoudou Issei, lived my life as a regular high school student. That is, until a fallen angel dragged me into a world of chaos I never thought could exist. ...Maybe this is where my talent was meant to shine all along. Disclaimer: Highschool DXD is not mine nor are most of the characters used here. It is the property of Ichiei Ishibumi.

Espero les guste mi nueva historia. haré lo mejor que pueda si no les no la lean. todo personaje usado en este fic pertenece a sus respectivos creadores.

The Boosted Gear has known many hosts, but none like him-a soul from another world, wielding draconic power with the ease of a man born to it. In a world of arranged marriages and sacred treaties, he answers to no one. Not the Church. Not the Devils. Not even the beautiful Crimson Heiress who watches him with fire in her eyes.

In an alternate universe where fate dealt a cruel hand, Issei Hyoudou awakened his Boosted Gear at the mere age of ten, not through curiosity or lust, but through blood, loss, and vengeance. Unlike his counterpart from another world who grew up a carefree, perverted teen, this Issei was forged in the flames of tragedy after a stray devil slaughtered his parents, leaving him orphaned and with nothing but the dragon within him to survive. Now, as he walks the path of power and destruction, rejecting coexistence with devils and rejecting even the notion of peace, his journey is one of domination. But beneath the rage and hatred lies a question that haunts his every step-will his path forever be painted in crimson, or can the light still reach a boy destined for more than just war?

Knull, a name that struck fear into the hearts of the strongest gods and beings of the supernatural. His power's that rivaled Shivas and Indra's. The slayer of the Sky Dragon's makes his return through the blood of a newly birthed devil. Issei will wield the Necrosword sword and have the powers of Knull. This book will have a darker version of Issei but not crazy dark.

Love between two factions is always considered a taboo. However when a hero and a devil princess fell in love with each other and created an offspring. All hell breaks loose. DXD fanfic with graphic themes. Read on your own risk