I'VE BEEN DWELLING ON THIS and there's lots of ways to do it, it just depends how many things you want to throw at one thread at the risk of not getting as much spotlight as you want for each thing.

Like, it'd be easy for Ianto to have a TOO MANY DEAD PEOPLE AFTER DISASTER moment and begin freaking out and John could trigger himself off an empathy bond trying to calm Ianto down and just getting ALL HIS EMOTIONS via touch but idk if then having John begin to lose his chill in the same thread would take away from The Drama of that initially for you