Myself (27), my 21 year old sister (Kim) and her 49 year old boyfriend all engage in sex on a regular basis. What I mean is they have sex and use me as a toy. They have me wear panties 24/7 and use paddles, whips, dildos, butt plugs, etc... on me all the time, When Kim is on her period he fucks my ass or throat so that she doesn't have to. Recently they upgraded the butt plug I have been using from a Doc Johnson medium to a large and I have to say it was quite a stretch to be able to take it in my boi pussy what they have me call my ass. Our family doesn't know that this all goes on when Kim and I go out to spend time together as our family doesn't approve of her dating him. Also there is no way that I am going to come out as bisexual to them anytime soon let alone tell them that I am with the same man as my sister. Kim just went to the local toy store and made several purchases with him while they left me bound and gagged in the bed room at his house. They haven't showed me what they purchased yet but told me that I would enjoy it this weekend which is the weekend of 5/15/2015 to 5/17/15. I am excited and to be honest a little frightened at the same time because the credit card receipt they showed me was almost $500 dollars on items they planned on using on/in me. I cant wait till this weekend to find out what kind of nasty things they will be doing to me.