Reminded me of this post where op explained that sukuna nd yuji been playing this game since the beginning.. Like, sukuna tries to talk to yuji A LOT!!!! nd that's why yuji slapped his hands on sukuna's mouth im front of gojo nd sukuna kept talking through his other mouth as if nothing has happened at all 🤣🤣🤣.. It proves they both by this point had got used to each other's antics enough..
I would suggest you to read this particular thread nd other threads too if you are interested in learning abt sukuna..

https://www.tumblr.com/tangsakura/809930975496814592?source=share