Despite having prepared the answers a thousand times, it was still going to prove difficult. How on earth can a mother explain to her son that she is ...also his father as well? How can she also explain to her son that he is also her daughter as well? I was going to have to choose my words very carefully. I decided to test the waters first and find out how much he knew."Darling, how much do you know about boys and girls?"He frowned as he spoke slowly."Well Susan's got a vagina where I've got my. .."Oh No...Oh god...Oh god!" And he kept teasing her saying he would keep it up till she begged for it up the ass.Finally she did: almost exhausted, Anita mumbled... “Yes, yes… fuck my ass...”He whooped with triumph saying: "Louder, slut, I cannot hear you" Then my sweet wife yelled out " Yes, you bastard… I want you to shove your huge black cock deep in my ass…!!!”.So Big Johnnie made her mount the biggest guy, standing over him on the edge of the bed. Then he lined his cock up while the rest. He stood up and almost ripped his trousers off and stood before me.I looked up into his eyes as I took his hard cock into my ready mouth again and as I did I tickled under his balls and reached around to tease his arse just liked I liked. His cock grew even harder if that was possible and he moaned deeply. It wasn’t long before he placed his hands on my head and started to thrust into my mouth which I absolutely loved. I could feel him start to twitch and thought I was about to taste my first. .. I'm gonna cum!" I said loudly.Skylar sped up even faster.My cock erupted and shot jizz up into Skylar's tight pussy."Yes! Cum in me!" she shouted and then moaned. The moan was Skylar's second orgasm. She became so relaxed that she collapsed on top of me. I wrapped my arms around her as my cock finished delivering its load."How am I doing so far?" she said out-of-breath."I only give out grades at the end."She faux pouted."You're half way there. A definite A so far. You can only go down. Down.