Mom helping her son before the exam

Mom is sleeping naked,son enters the room and wake her up ,complaining that he is too nervous about the exam of tomorow and he can't sleep.She call him to sleep with her like old times and give him a hug without even thinking that her is not a little boy anymore .She start feeling something hard pushing against her naked body. In the beggining she a little bit frustrated,but then she decide to use this for son's own good,to help him release his stress before the exam so he get best results at school...