As long as he had enough visual and/or mental stimulation with a little squeezing of this thighs against his penis he could come but it would take that little thigh pressure to finish him off. That's happened to me already. For me it'd take a girl to be dressed in a way that'd really tease me and be doing things that'd tease me even more. Like a girl with great legs in a short skirt or a girl with nice boobs wearing a tight top and then flaunting what they have by what they're doing... stuff like that. I'm talking about a girl you like, not just random girls.
You can easily do it just by talking to him dirty and teasing him with a great mind-F***. Look but can't touch game. Egg him on as he get closer. He will come if you keep him from acting out! In fact, you might even like seeing him squirm.