When he'd first suggested it, you'd thought your husband had gone insane.
Ever since the betrothal he'd been perfect. Prince Aemond, despite his rumored brutality, was exceedingly good to you. Long walks in the gardens were spent in peaceful quiet, neither of you feeling the need to fill the space with meaningless noise. He read to you in High Valyrian in the evenings if he wasn't preoccupied with duty.
Out of all the men in the realm you could be bonded to, you are glad your father had chosen Prince Aemond.
So when he pulled you aside after lunch and asked to take you on the back of Vhagar, you were stunned. It wasn't that you were afraid of Vhagar herself. The massive dragon could feel that you were loved by her bonded rider, and anyone her boy liked she liked too. But the inherent scandal and risk of doing what your new husband suggestion was both terrifying and exciting.
"I will not let you fall, My Lady. Neither will Vhagar," he assured you that smooth, low voice of his.
And so, because you trusted Aemond with your life and happiness, you mounted Vhagar. The she-dragon was no idiot, she could feel her rider's emotions. So she kept a steady glide to nowhere in particular while Aemond pulled you close.