Brother and sister are struggle together trying to fuck each other. Mom walks in and sees the two of them having a tough time and starts to teach them what to do. With some expert advice from mom, brother and sister are fucking each other. Alex's dick is so big that Marsha needs a little lube. "It's so good!" cries Marsha. "Keep fucking me!". Mom is teaching them all different positions. Mom wants to taste her daughters cum on her sons cock! Now mom wants to taste her sons cum, so he pulls out and explodes all over her face!