Usually I go down on my wife when we have free time after work after our son has fallen asleep but it seems that he wakes up as soon as she gets hers...then we or she puts him back to sleep a few hours later after the nap and she goes right to sleep and doesn't reurn the favor! What should I do?

Women are sometimes embarrassed to be truthful with this situation. Maybe she doesn't really know what she's doing. Maybe she thinks she doesn't do it right and doesn't really know everything there is to know. I mean, it seems pretty self explanitory but I personally avoided being on top for a LONG time because I didn't really know if I was doing it right.

Also, it might be best to say to her you want her to go down on you. Sometimes you need to say the obvious because it might not be that obvious to her. Maybe you just do it so great that she can't even think right afterwards, so you need to be vocal and tell her what you like and how you like it!