
Ian getting reminded of TJ during the sex could be an indication of something that he has to do. Maybe we will know this in the future chapters. Because he also didn't tell Jo what he wanted to know (check) with Jo. The timing is very important here. Why TJ never cross his mind during the previous sex he had with Jo? Why only now? When both Jo and Ian felt like they are having sex for the first time.
In the recent chapter it's more like we are seeing Jo's pov (his thoughts). Jo actually re-evaluating his decision that he made in chapter 32. He thought he did something right at the moment by getting in between Ian and TJ without knowing what happened. He was selfish and acted without thinking just to end up seeing Ian going back to TJ. He is thinking about that flashback as a consequences of his actions. It's hinting that he has to know about everything in order to understand them because mind you Jo, still doesn't know anything about Ian, TJ or the world they are from. One thing about Jo is if he makes mistakes he will acknowledge his mistakes and try to correct it. And he is also very observant so this new chapter will influence his decision making in the future.
I can't contain my laugh. from what I saw from the recent chapter (korean version) tj makes sure to haunt Ian and Jo in their dream and thoughts lmao