sorry for the repost but I put this in the wrong thread and its better put here (and upvoted so many times it cannot be ignored as a classic scene idea) :
OK here goes
I am still looking for a scene with a girl (preferably slim brunette) in high end dress,- ballgown, cocktail dress etc, where they keep the dress on but hike it up and just go for it in a sea of taffeta, velvet, satin and sexy stockings
How about you are watching your GF give a cello performance at a classical concert, and you go backstage and rail her during the "intermission",
perhaps to make an entertaining closure, she then attempts to straighten herself up for getting back on stage but forgets to put her panties on by mistake, giving the audience a bit of an unexpected show as the scene ends, maybe even still dribbling a bit of creampie