I LOVE MESSING UP WITH MY STEP-SISTER! ESPECIALLY WHEN SHE IS TIRED AND CAN'T FIGHT BACK. THIS IS THE PERFECT TIME TO TICKLE HER WHOLE BODY, KNOWING THAT SHE WILL BURST FROM LAUGHING. THE MOST TICKLISH PART OF HER BODY ARE HER ARMPITS. HER BARE FEET ARE ALSO PRETTY TICKLISH. I WILL USE MY LONG FINGERS TO GET THIS LAUGH OUT OF HER.