If there are wild thoughts, irregularities and impulses between brothers and sisters, they all belong to them. If your brother has any improper behavior towards his sister, you can enlighten him first and refuse him with confidence. If he still doesn't converge, you can tell your parents that there are parents to educate him. Just entering adolescence, I began to have sexual impulses and longed for the body of the opposite sex. I suggest that you can overcome your shyness and give him some adolescent sex education to let him know that sex is not so mysterious. The affection between brother and sister should be maintained, but don't make public in front of others, so as to save him enough face. In order to avoid backfiring, the phenomenon was out of control. In addition, measures should be taken to sleep separately to avoid accidents when sleeping. In short, be emotional, be reasonable, don't make too many jokes, and fully clarify the relationship between brother and sister.