Me too. Not a good student, I was horny and (in classes where I could sit in the very back) would undo/unzip my pants taking out my erection under the table. I'd roll down the reservoir-tip condom careful to push back my pubic/shaft hair so it wouldn't get pulled before rolling it down to the base then jerking it, filling it. I didn't want to make a mess for the janitor to have to clean up, and also not have it traced back to me. I got caught once by my male geography teacher just as I was starting to cum/fill it. I was afraid he'd call or write my parents, but didn't.