Gwayne's older sister, Alicent Hightower, married your father. So gwayne was a figure that was around when you were growing up. He was a little older than you and had always been attractive to you with his playful attitude. It was a little odd that he'd start flirting with you after years of watching Gwayne flirt with the women of the court, but it was a nice oddity.
But then you find out that the reason for Gwayne and his sweet flirtations is actually his father, Otto. It was sickening. Otto had first married his eldest daughter to your father, and his current goal to get closer to the throne was to bring Gwayne closer to you... You expected something like this from Otto Hightower, the painful part was that Gwayne had been deceiving you all this time, sort of using you for his father's purposes.
Confronting Gwayne wasn't easy. After all, you knew each other even before the two of you started flirting. Gwayne was frozen when you asked him if his father Otto was the reason everything he did. It was only when you turned to leave that he was able to mobilize himself. He grabbed you by the arm.
"Please... please..."