Characters
Original Female Character(s), Merlin/Arthur Pendragon (Merlin), Merlin (Merlin), Arthur Pendragon (Merlin), Gwen (Merlin), Morgana (Merlin), Agravaine (Merlin), Gaius (Merlin), Knights of the Round Table (Merlin), Gwen/Lancelot (Merlin), Uther Pendragon (Merlin), Leon (Merlin), Lancelot (Merlin), Gwaine (Merlin), Elyan (Merlin), Percival (Merlin), Morgause (Merlin), Mordred (Merlin), Morgana (Merlin)/Original Female Character(s), Morgause (Merlin)/Original Female Character(s), Morgana/Morgause (Merlin), Kara/Mordred (Merlin), Morgana/Morgause (Merlin)/Original Female Character(s), Kilgharrah (Merlin), Sefa (Merlin), Cenred (Merlin), Aithusa (Merlin), BBC Merlin Characters - Character, Kara (Merlin)
Tags
Incest
POV Original Female Character
eventually
Evil Uther Pendragon (Merlin)
Merlin is Emrys (Merlin)
Merlin Has a Younger Sister
Merlin Has a Sibling
Gay Merlin (Merlin)
Gay Arthur Pendragon (Merlin)
Gay Morgana (Merlin)
Queen Morgana (Merlin)
Half-Sibling Incest
I Have No Idea What Their Ages Are As I Can't Find A Solid Answer Anywhere
So I Chose Their Ages
Morgause Is Five Years Older Than Morgana
Merlin Is Eighteen In Season One
Arthur Turns 21 In Excalibur
And He's 20 In The Beginning Of Season 1
Morgana Is 22 In Season 1
Cassie Is 15 In Season 1
Cassie and Merlin Have Magic
No One In Merlin Is Given A Surname Other Than The Pendragons (That I Can Remember)
So I Gave Merlin and Cassie The Surname Black
Gay Morgause (Merlin)
Arthur and Merlin Take Morgana's Side
Summary
When Merlin moves to Camelot, he brings his younger sister (Cassiopeia Athena Black) with him. Cassie quickly becomes enamoured with Morgana while her brother slowly falls for Arthur. How will Merlin and Arthur's feelings for each other and Merlin's sister falling for Morgana and Morgause change the timeline? Will Arthur win just as he had when he was with Gwen? Or will Merlin's feelings for his sister and Arthur's feelings for Merlin change their fate?