What causes fetishes like bdsm/foot fetish?

I have a panty fetish my wife caught me smelling her sisters panties and I thought we were done she just wanted to know who they were so I told her the truth she reconized them kuz she had barely moved in at the time she told me to put them in my mouth and we had the most amazing sex ever she let me cum in her sisters panties after that and grab dirty ones while we have sex then I pulled out cummed on the clean ones bras and all and put them bak for them to were I did that to both my sister in laws and the youngest one knows shes over 18 but ive been doing it to her for 3 years I currently stole all her panties and most of her bras after I wore them she knows I do it I take them soak them in cum for days all over her ass and pussy let her wear them and she does then take them after words she had 10 panties and 4 bras know she currently has 2 panties and 2 bras I barely stole 1 last night with my cum on it I love smelling her ass and pussy and looking at my cum stains knowing they were touching her booty hole and pussy they go up when she gets wedies and camel toes she lives with us and shes a virgin so I been the first guy cum to touch her pussy and between her ass checks and titties she so hot she has a nice body im going to buy her new panties and bras tomorow so I can take the rest after I cum in them and she wears them she knows what girl wouldnt notice her panties and bras missing especially like that she asks my wife and she plays stupid im about to go cum in her bra right now. theres nothing more satisfying them going threw a girls panty drawer stealing a pair of clean one for days cumming on every inch espically the vagina and ass are and up were it goes up her but checks making it white to were its noticable and putting it back for her to wear espicially a virgin and doing it for years when she used to spend the night id soak them right until the morning staying up all night mastubating on them to wear they were soak smelled like nothing but my cum id put them up bak in her bakpack right b4 she got up so I know she had fresh cum touching her virgin pussy and asshole id would only steal a pair but she was going over to her other sisters house which I cummed in as well the first one to she over 18 as well thats the one my wife caught me with the first time she was so hot at the time and had the best smell ever she had a baby tho. her boyfriends brother got caught stealing her underwear and they got into a fight she looked in them and there was white stains everywhere so I guess its a common thing a panty fetish anyway that wasnt going to happen again which is why I stole all her sister that lives with us panties so she knew there was panties thiefs and she would b more careful kuz nobody was going to cum on her panties and bras and toothbrushs but me. ive been doing it for three years and me and my wife have amazing kinky sex everytime she shoves them in my mouth and i taste her pussy im about to buy her new panties and bras today dont worry only to cum in them let her were them and take them again so i can smell her pussy and ass and see where my cum is touching. I love it that she lives with us kuz I get to look in her panty drawer and see which ones shes wearing and watch her walk around all day in them then take them afterwards kuz I cant imagine any1 else cummin like her other sisters boyfriends brother did so I beat her to the punch and taught her what could happen so shes more careful she knows shes looked at me weird at first but know its like nothing she likes it. like I said its more common then U think. My wife also lets me buy used panties best kinky sex ever i save them in ziplocks and have her scent with my cum on them for 3 years and it still smells fresh not as strong but still there and my cum stains are to so any girls ready this as a warning watch ur panties and always check them b4 u were them espically in the crotch and bootyhole area im just trying to help the woman and spread awareness its common alot keep ur panties safe cuz a guy will pick them up and smell ur dirty ones defintly take them out of the restroom and wrap them up trying to help stop this from happening to any other females unless u like it some females do send me a pair of ur dirty ones and a picture of u wearing them or a video of u taking them on and off and ill send u a video of me smelling ur scent and jacking off to it or ill buy u a pair I want u to wear and send u a video of me cumming on it make it white and u can wear it and send it back ill pay for shipping and handleing

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