Sophia tied me up and I challenged her to do her worst! Bound at my wrists and ankles, tied to the bed, she takes a big wand vibrator to my sensitive clit. I've never used a wand and it quickly overwhelms me. Sophia doesn't stop the vibrator torture, determined to make me cum 10 times! She tries 2 different wands on me as I moan and writhe and thrash, orgasming again and again. I want to win the challenge, but I don't know how much more I can take!