What's the hell is going on in my bed?!?!!....Old man caught his wife with his Son!

The youth of today are growing up so fast! Each new generation turns out to be more depraved than the last. This old man had fallen into the same trap. Trying to introduce his offspring to the joys of sex, he was surprised to discover many new things, and the youngster's birthday party unexpectedly turned into a master class for the generous daddy...