I stick with it. these are good reasons you put forward why Sophia cannot "ask" Dylan for help.It is a very extreme scenario, no way would Dylan let Aiden as he pleases with Sophia. Considering last event we found out how he had even beaten up a few guys of Aiden's gang and how much he resents Aiden. Anything would be better than involving her son. At the same time he absolutely will not allow Sophia to do this for his sake. Thirdly Sophia herself wouldn't be able to bare it doing all those acts in front of her son.
It is to prevent Dylan from being involved in this that Sophia is doing the tasks. If he will be roped into it then the sensible solution will be to stop the tasks and to take Morello's help, rather than doing perverted stuff infront of her son or stop the tasks and rely only on Carl.
However, according to Sophia's current knowledge, Morello is also not a risk-free way out. It is the mafia that Sophia asks for help. In an unknown city, in a foreign country, the people who have just threatened Sophia's husband with death. Also, Morello is only available as a solution now, and then no longer (as far as we know). On the teaser we see a worried and scared Sophia. Not a woman who is waiting full of joy and self-confidence for Aiden's next task. I think Sophia will experience the next task as an absolute humiliation and she has to choose between resistance and absolute loss of control over her personality and her life. So we'll see the woman go to work with a face like this every day. I can't see the eroticism in it.
These are not good reasons to involve Dylan, but there is a cuckold route for Dylan, that is, a route on Sophia cheating on her husband and Dylan watching. That means Dylan not only has to put away his jealousy but also the knowledge of the meaning of his mother's actions. For Dylan it goes from 0% to 100% from the perverted but realist innocent teenager to the perverted and absolutely corrupt pig. Including Dylan in the Aiden blackmail would have the benefit of both of them doing what Sophia and Dylan are doing to protect each other. But as I said, I understand your reasoning, there are many "if-then conditions" in my proposal. I can only wait for the "master" to surprise us.