when I was in college, I would tend to live in the library. my roommate was always having his very annoying gf over. have sex all night, not letting me sleep. so I did all my work in the library, I would sometimes nap in their too. one day, I was very bored, but also horny because the library assistant, is this really hot student. and today, she wore a very revealing skirt. being locked out of my dorm, and the bathrooms have no privacy. I went into the corner desk of the library. I put a big book on my lap to hide my dick. that is where I got off numerous times, but I got braver. I saw the assistant stacking shelves, high shelves too. I went behind her, covered up with a book, and jerked off. pretending to find a book. being up on a ladder, I had a nice view of the girls legs. when she came back down, and was working on the bottom shelf, I shot my cum on her skirt. about 4 loads of cum burst out, making a huge mess on her ass. I cleaned but but I didn't leave the library. I waited till she sat down again, and she discorvered the mess I made. I love the shocked look on her face, I did this only once though, not risking it again.