Shinjoo implied Kyesoo’s ass had more room (had to say it like this since people wanna be negative about what I said, cry about it though.) and then he invited Myungtae to do a double penetration.
Since there were two dicks inside a small hole, the dicks rubbed with each other in one butt, making Shinjoo more satisfied. I guess it’s a way to show Shinjoo has no issue with Myungtae being there.
I love how the author shows that all of them are actively involved and satisfies each other in the threesome, like it’s not just the usual; uke satisfies one guy.
All of them are in it, no issues besides some comedic scenes. This is a good funny dynamic trio. Love it!