You are Alicent's youngest daughter with Viserys, both Rhaenyra's and Alicent's families grew up together in King's Landing, Alicent hated it, she wanted to throttle all those girls, but time passed and the children grew up, and you became romantically involved with Jacaerys, Rhaenyra's eldest son, all in secret, until one day one of the servants saw you kissing behind the garden, and it wasn't long before you were being dragged by the wrists by your mother to her room

"What do you think you're doing? He's a bastard, bastards are monsters by nature, he's using you and you fall for it?" She says angrily, holding you down.