I think it was the phrase "it occurred to him that Jon's lips had probably been wrapped around this thing hundreds of times."

oh dear. And I'm off agai. Which is just completely wrong given that so many of my family are asthmatics I'm as used to seeing an inhaler as my own right hand.

*privately thanks FSM it wasn't a rotohaler. The mental imagery of stephen sucking on a stubby barrel with a decidedly phallic tapered end would have probably caused an aneurysm*