Instilled

What if Adrian and Juleka had a brother and sisterly bond. For a long time the only close friends Gabriel approves for Adrian are Kagami, Chloe, and even Felix. But when Jagged Stone and his children make their mark and one of his kin makes a request, Gabriel not only uses this for his own advantage but Adrien ends up getting the sibling he deserves. Even Felix and Kagami too are fond of their new friend.
(Sidenote, in this AU, the timeline takes place in season 5, Roarr, and Longg are in Marinette's care and they are not trapped in Gabriel's grasp, and Gabriel in this AU is a little nicer.)