In the choking part he's told to shake head instead of the safe word cuz he won't be able to talk, also banana milk is their safeword....he is just too freaky and was feeling too good he didn't want to stop
ok so im a martial artist and tbh you're right, breath play can be dangerous, but geonwoo ofc knew what he was doing and established a way to "tap out" since hajin couldn't actually tap out bcs he was tied up. it comes down to knowing strangulation techniques properly and controlling your strength, in martial arts we learn how to do that to not injure our sparring partners too gravely. buuut to the average joe, there's a certain oblivion to that so it isn't recommended to do more than some light choking (which imo is more sensation play than breath play). sorry for yapping but i just thought id share that if anyone else has safety concerns!!
No safe word used? Or he can't use it as he is being choked. And don't imitate in real life, choke play is dangerous. One second longer and he will go to bear heaven forever.