Script: This would be all solo-simulated however you want, from your son's POV, and the cum shots can be off camera. The idea would be Its your birthday and you are already naked, waiting for your son to bring your “special present,” a well-hung friend. For a while now, he has been your happy cuckold. The friend he brought this time is especially big, but you still think your son’s cock is bigger. Again, you don’t really talk to the friend. Instead, you focus on giving your son JOI, telling him to stroke the cock that you made while he watches his friend’s cock penetrating the pussy he came out of, etc. Having him watch really turns you on, so you tell him to feel how wet it makes your pussy. He isn't sure if he should, but you insist. Then you tell him you want to feel how rock-hard he is. Again, you insist because its your birthday. You love the feel of it in your hand, so you start stroking. However, the taboo contact pushes the friend over the brink, so he creampies you. You stop stroking and ask your son if he likes seeing all that cum in his mom’s pussy. You can tell he does by the way his cock is twitching and throbbing, but you won’t let him finish stroking himself off. If he wants to cum, he has to give you a second creampie. Again, he is not sure he should but he is aching so bad, he agrees. Then you are impressed when he doesn’t immediately blow his load. When he does, its huge, which thrills you so. The friend enjoyed watching, so you jokingly suggest making him your cuck, before sending him home, so you can talk to your son. You know how much gratification he gets from being your cuck, but he needs to understand his mother needs more than one dick. Since he has the biggest cock you’ve ever seen, you want more of it. He has to help his friends fuck you. You give him a tender kiss and tell him he is such a loving son and it has been so much fun cucking him, but now he is going to be a great lover.