It's true.. but I guess this time it's not intentionally want to do it?. It's a body reaction any one can react on that when you were in his scenario?. Besides he even try to hook up right? after Dan disappear? But his body didn't react not when he is with Dan?. Dan mis understand of what jaekyung said. That's why he have no choice?
Idk y I can’t see it this way. Anyone who sees Dan can tell that guy is half dead, he got no sparkle in his eyes and his grandmas condition is pretty much public news and when he taunted jaekyung with sleeping with him, he just jumped into it. He is an immature boy, even if he stops in the next chapter, it will be cause of his guilt and not his consideration or empathy for Dan.
He did not get hard… HE DID NOT JUST GET HARD FROM THAT!!!!