007. Ceremony
They get married.
It was a spur of the moment thing, really.
Tony has been engaged no less than three times and has developed a very now-or-never idea about marriage.
Pepper has been married twice before, both times to the same man and both times after about five minutes of planning ahead. She has always had a very now-or-never idea about marriage.
She's afraid of cold feet. He's afraid of one or both of them being killed by a costumed fool with a grudge before the vows are completed. In the end, they are in agreement.