"Onanie-Schule" by Mr. Joker (more from this author)
Well, you could call this a Stroker clone. Onanie Schule, another
German product (Jeez, those dirty little Bratwursts), which means,
well, masturbating school. Yup, learn how to beat your meat. They
just give you the (slowly accelerating :) rhythm, you do the rest.