I want to do this to my unappreciative 20 yo daughter 

I confess that I get horny thinking about being groped in public, or unwillingly fingered at a concert. I like chatting on sites and giving out info about me in hopes of getting molested. I get horny thinking about how I masturbate with my window open in the off chance someone comes in, or getting bottle fucked at a party while drunk.

I had to endure many subway rides were a man's dick was nestled between the cheeks of my fat ass.

On one occasion when I was a teen and was quite plump, and on my way to college, I was abused in a crowded subway. A perv got on the train and probably spotted me and moved in behind me. I had nowhere to go and he had me cornered against the train door. He had sweatpants on that had pockets. He had his hand in his pocket and the pocket lining was cut out so he could access his dick through the pocket (my friend educated me on how they do that). He was obviously jerking off and would stop every few seconds to hump against my ass. He was jerking off with his dick against my ass (his hardon was obvious through the sweatpants). After a few seconds I caught on but couldn't move.
The man had pushed himself harder against me. There was no doubt now that I could feel his erection through the fabric of his sweatpants and my leggings.
I could feel the heat and weight of the man's flesh through the lycra of my leggings. I could definitely feel his hard cock rubbing on my ass and then settling into the crevasse between my butt, rubbing on my leggings.
The crowded train and the doorway offered me nowhere to go. My face turned a bright red as I was forced to accept my predicament. Shamefully I was getting wet. I couldn't help it. But I didn't want to. This wasn't right. This stranger was taking advantage. But what if I just let him...what if I just let him satiate himself against my fat ass? What if I allowed him to that? If he didn't put it inside me there was no harm no foul was there? He might get angry otherwise. He might try and rape...no! He wouldn't surely! Maybe just let him continue to do what he was doing? So-what if I was a little wet and shit scared?
He grew bold as he saw I offered no resistance and placed his left hand on my left ass cheek and humped away against my ass with his dick in between my cheeks and then lowered his sweatpants just slightly and came all over my ass. He rubbed it into my ass with his dickhead and got off at the next stop leaving me molested and with a huge cum stain on my leggings.
On my next stop I had to run to a washroom and wipe his cum from ass using a handkerchief. I did my walk of shame to the college. Anyone paying attention to my ass would know that my ass was cummed on. My entire day was traumatized but moreover I felt guilty for being wet by getting abused and molested.

My therapist said that it's common and a biological response from my body to not get hurt from being assaulted (Although he never penetrated me)
What I didn't tell her was that I went home traumatized and while undressing I saw the thick stain of my juices on my panties and although ashamed and guilty I became wet again. Then strangely out of nowhere I shamefully smelled my leggings, it was a stench of my sweat, my juices and his cum. I inhaled it by pressing my nose into it as I rubbed my clit roughly imagining the traumatizing event of the day. I started moaning and to gag myself I shoved the cum covered handkerchief in my mouth. Drooling and swallowing my saliva with my molesters cum. As if that was not enough I wore my leggings over my head pressing my nose on the places of cum stain and where his cock was. In my mind I was degrading and shaming myself, calling myself a whore, slut, cunt as all the feminism and my dignity was dripping out my cunt. I felt guilt and shame of how I am behaving and how I was wet during the molestation and it made me cum, my legs shaking and my eyes rolling back in my head as my body convolusing violently. My body went limp and after a few minutes I gathered my strength to slowly pull off the leggings above my face and I saw myself in mirror beside my bed. I was naked lying face down, sweaty, handkerchief in my mouth, leggings stuffed over my head. Shame, regret and guilt filled me as I started to see the pictures of my friends and family on my dresser. With tears in my eyes I realized of what I have done and how lowly, Wanton and a filthy whore I am. I was ashamed of the person in mirror who didn't have any dignity, self respect and was lying like a piece of limp fuckmeat. And then I felt the tingle in my stupid cunt again and I started rubbing again feeling the mix of regret, shame, humiliation as I saw the stupid fuckmeat in the mirror along with my friends and family pictures. Gagging on the handkerchief I called her disgusting names as my reflection came like a bitch. Shamefully again I covered my face in leggings and I rubbed my shame on my molested leggings.
That night I came 2 more times while degrading and abusing my cunt as moved from awake and sleep states. The next morning I woke up with tired body, sore mouth, sore cunt and reeking of the stench of my juices, sweat and his cum.