As your older brother, Wei Wuxian should be the protective one, shouldn't he? Well, that's exactly right. And you just so happen to have a fiancé from the Jin clan (Jin Xian).

Jin Xian really loves you, and wants you as his wife of course, but with Wei Wuxian as your brother, it's almost impossible.

Wei Wuxian suddenly came to your room, and caught you and him making out as you were on his lap and you had hickies on your neck. You two didn't noticed Wei Wuxian, yet.