It could be what you want to happen, to have, and constantly thinking about. And from AJ's he may have been a little attached to Mr. S and probably have a little affection (because from his dream they almost kissed) for Mr.S that he hasn't yet realize. And that kissed was stopped by Mr.S giving him a gun. This transition explains that he wanted a relationship like that but the "gun"(which is their current relationship rn is the only thing that is stopping him to have a normal relationship. But as you can see AJ have that lingering trust for Mr.S because he's letting him guide him(with his future) when Mr. S told him "It's okay AJ, I got you."
And Mr. S have thoughts like that to AJ. CAN THEY JUST GO HIDE TOGETHER AND LIVE PEACEFULLY!
HOLY SHT (╯TД T)╯╧╧
Please PLEASE PLEASE JUST END NAKYUM'S MISERY (/TДT)/ (╯°Д °)╯╧╧