The finger was only big enough for her ass, so she improvised.
imgur.com category @IveMadeA_HugeMistake
She's fingering herself while eagerly looking at her Mistress' big bulge [x-post: /r/HiddenStrapon]
gfycat.com category @iboydm
Fiddling Her Diddle: 8 Awesome, Up-Close Finger-Play Gifs With The Mrs. [M+F] (GW Xpost)
imgur.com category @alien_boner
Getting her finger wet before sliding it in (HTML5 via /r/PantiesToTheSide)
gfycat.com category @resaysay
imgur.com category @Blankman87
imgur.com category @bobthegravy