what does it mean when the cum is thick?
His was thin, which suggests he must’ve come sometime before meeting Gyeol at the beach. We saw in the earlier chapters that the boss assaulted him shortly beforehand.
In this case it means he hasn't ejaculated in a long time. The boss won't let him.
that he hasn’t cum in a while- aka him needing permission to release due to the creep of a boss
First he noticed the thickness of the cum at the beach (I think). Then the clingy behavior. Now the rope marks. I hope he figures everything out and goes after that boss. That creep has overstayed his welcome by a mile.