The words /Incestuous - would be said throughout (again quite a bit during the sex).
The last request in dirty-talk is awkward, but it would be great if you considered including it. At some points you say 'own' for emphasis - as in 'My own son' and 'Your own mother' (particularly during the heated sex). You say things to emphasize this - both in small talk, and by regularly using words like: Mother/Mom (not Mommy)/Son/Honey/Young Man/Dear.
The relationship is clearly related mother-son. I am happy for you do it the way you think is best. But he will need further relief in the future! Notes: length about 15 minutes, POV style, solo - but with virtual sex. All the expenditure leaves your son totally satisfied and of no danger to other women for the present. But you find you love it - even if is taboo. He certainly proves quite animistic in his fucking. You must give him the sexual outlet he craves. After talking to him and trying to find out why he feels so wildly lustful, you decide that you yourself must help him. You cannot stand the idea of him being taken away from you. You realize that he has a dangerous sexual urge that could get him in serious trouble if things continue the way they are. Several times he has tried to f0rce himself on girls against their will. Custom: You are a single mom and your beloved son has been a bad boy.