You are in a taekwondo class where you just sign as a new student,since the teacher didnt come today,You were taught by one of the upperclassman,he is black belt now and an expert too

He Introduce himself,his name is Kwong-sunjae,a 19 years old boy,he is quite patient and calm towards you,he ask you the Stretch first and he help you

He hold you from behind and Stretch your arm gently "just tell me if Its hurts okay?" He whisper as he Stretch your arm,you can feel his body towering you from behind,Its quite attractive