Authorized to watch Mom SeXStoRY

After several years paying for extras Math classes without any success my mother quit. One day I caught my mother dressing and I've seen a glimpse of her huge breasts, this never came out of my mind and I've been fantasizing with that moment since then. When my last grades came she got really hungry with me again about Math, yelling to my face once more: "What can I do to change this? I've tried everything, bláa, bláá, bláá....". Then without thinking, this words came out from my mouth: "I want to see you naked, Mom.". The yelling stopped. I thought a slap on my face was the next step, Instead she said: "If next period you bring me a C, I let you watch me having a bath, if you bring me a B I even let you take me photos because this will only append once, agree?"