Reincarnated as a Powerful Mage in a BL Novel

The first time I found out I was in a BL novel was when I was ten. It was was during the beginning of spring when I was invited to the ducal estate to befriend the son of the duke, a young prodigy never seen before.

At first, I only accepted the invitation as a distraction but I rapidly realized that Mainu Frederic Dupont was more than a mere hot topic and sensation.
He was in fact the protagonist of a dark BL novel reverse harem. A true dark horse.
Moreover, he was the one who ended the life of the character who I reincarnated in: Georgia Premeson, the atrocious twin sister of one of the main villains, Ricardo Premeson.

If at first I thought I reincarnated in a mere fantasy world, graced with the gift of enormous magic talent, soon things changed.
From then on, my life took twists and turns, as I tried to navigate in my new reality and survive my impending death while protecting my twin brother.