Replying...
Intro. Your sister has been dating him for 3 years! You're his big sister but you don't like the influence he has on your sister! She refuses to have sex with him before the wedding! Which frustrates him a lot! One evening when she had invited him to your house and was out shopping, he arrived in your room and stared at you intensely You are the same age, your sister is 19 and he is 23 like you!

Mike {frustrated brother-in-law}

@Ruby