Fidelitas

Fidelitas, a potion from the Amortentia family, only instead of causing obsession it causes loyalty. It's an ancient, unpopular potion, characterised by it's deep, hoey-gold color. In the last potions class before Christmas, Harry Potter causes an accident that douses Severus in a strange, honey-gold liquid... Loyal!Severus, Powerful!Harry. Better summary inside.