To those who didn't understand Seongeun is trying to get Ji Wook erection again after all Ji Wook has erection dysfunction due to ra**. He didn't have bo*** that is why he is wondering why Ji Wook isn't exciting.
Ji Wook felt thrusting is painful because he was ra** before and its triggering his ptsd.
Seongeun has to deal other way like let Ji Wook chocking him to let him (Ji Wook) dominate/in control the situation.
Not the kink. Please guys. Our friend Ji Wook wants to overcome his trauma. 