Sister addicted to self bondage ?

Description: I noticed that my sister was secretly playing with self binding.she spread her legs wide open, tightly tied to the chair, sat like a duck.i touched her body, very smooth, but she didn't resist.today, i can play with her to my heart's content.she lifted her hips high and let me slap them.i tickled her, poked her sensitive areas with my fingers, and she kept moaning. her legs tightly gripped the vibrator, enjoying the pleasure. she was lying between my legs, took the initiative to serve my penis with both feet, and finally had a surprise.