Looking for a story

I once read a story where two twinks tries to burglar a sex shop. After an initial visit the come back when it's closed and go to the basement where on of them trying what is supposed to be the Rolls Royce of handjobs machines. But he gets restrained by the machine and his cock and balls endure a harsh milking. The owner arrives and changes the machine setting to a more experimented one, much stronger and the helpless boys suffers on the machine. Does it ring a bell to anyone ?