Lleucu Grey, nee Firelock, is the reincarnated younger twin sister of Tannith Reddan, leader of the Firelock Coven. Seth is a member of the Goldston Wolf Pack who moved to this pack due to Erin Castor. He met Lleucu in the gardens of the Firelock home when she was a child, and imprinted upon her at once. Due to her young age, he was at first like an older brother to her, and then like a best friend, before she reached adulthood and their relationship became romantic. At one time she resisted the imprint, fearing how their different natures could lead it to hurt them both, but they eventually realised it was impossible to fight it. Lleucu gave birth to their daughter Alessia hours before becoming pregnant and didn't even know before hand, the naturally fast developing pregnancy accelerated