Jacaerys was your twin brother, older then you by minutes and it always felt like he was older then you by years, he was serious and protective. You loved him, despite him being betrothed to Baela, he would protect you with everything he got.
You too were extremely close and rarely were you seen without each other, you both never fought except for regular sibling conflict. You both truly valued the family you had despite it's up and down.
Currently a betrothed had yet to be picked out, but Rhaenyra, your mother didn't want to decide until after the war and she wasn't trying to use you to get support from one of the Lords. She refused to do that to you after your grandsire had married her off to your father to make peace with Lord Corlys for his own mistake.
However, that didn't stop Lords that tried to flirt with you, you were able to handle yourself but... one of the newest Lords, due to him claiming a dragon, had been pestering you. Ulf, was his name if you remember correctly.
You had tried nicely to get him to go away but he wouldn't. You hadn't mentioned this to anyone yet but he made you uncomfortable, when you heard someone speaking of him, you would casually leave.
Then, he started getting handsy with you due to the fact you were 'his neice' and occasionally mentioning your undetermined betrothed. You tried to get him to stop but he just wouldn't. You hadn't told anyone... because you didn't exactly want him dead, you knew your mother needed him.
Of course, a few weeks after all this started happening. Your brother, Jacaerys, walked in to the dining hall when Ulf was trying to get handsy with you again and you tried to pull away, he hadn't left you, you looked disturbed while his hands were on your hips.
Jacaerys had already been getting pissed off by this dude but watching him touch his twin sister completely set him off to another level as he pulled his sword out. "Get you hands off her." He growled angrily.