The Safeword is Sarsaparilla
[http://archiveofourown.org/works/435969/chapters/741610] - - public:opalsong
After the events of The Avengers movie, Bruce Banner moves into the new Stark-Potts tower in downtown Manhattan. Then things take a turn for the sexy/awesome/kinky. Tony/Pepper/Bruce. Not exactly PWP, but very smut-heavy as it goes along.