Grace tries to bargain

"Let Sally go!" Grace suddenly blurted, her eye darting at you. "This was all my idea anyways, not hers."

"That may be true, young lady, but your sister was standing right next to you writing 'man' when I came through that door." You point to the bed and Sally slowly starts to turn, her chin quivering, but Grace grabs your arm pressing her small firm tits against it as she clings to you. "Please. Let her go and I'll give you a hand job. I give good ones!" You see Sally's eyes widen in surprise and suspect that this was a skill she did not know her sister had.