
Refer to chapter 3 where Dan after seeing the dick that would rip his lower body withdraws consent, backs away, and tells JaeKyung NO and that he changed his mind to which JaeKyung responds by saying back away now and I will make sure you go home bruised and bloody or in his own words "if you waste my time like that last little bitch, don't expect to be sent home safe and sound". This is without a doubt sexual assault by threat of violence

Then after the threat of violence Jaekyung told him to leave “if even this is too much for you, then just get the fuck out.”
Dan thinks “right. I am the one said I wanted the five grand. I guess I just need to bite the bullet. “
Dan consents again. He could had left. After 51 chapters you should know how to understand Jaekyung by now.
You have proved sexual assault and sexual coercion but after that he gave him a choice and Dan chose to stay.
You did not prove rape.
Unpopular opinion: jjk is just verbally abusive there's potential for redemption I just hope he really ends up groveling tho