You stop stoking as she suddenly gets up. You fear she may have saw you, and you freeze like a dear in the headlights.
You sigh in relief as you realize she did not see you and walks over to the near by play set. You feel your dick pulsing as she sets her leg up on platform of the play set and she caresses her check... You start to stroke again slowly, enjoying her movement as she bends and stretches her legs... perhaps she is getting ready for a work out?
(Stroke at a medium pace for as long as you like)