I don't like that Aaron is turning into Uncle Peter, even Daniel was more considerated when he fucked Lana for the first time, I hope Aaron can evolve but well... right now he's fucking her hard so it's a good replacement of the Uncle, there's balance with David and Aaron being different.
I think you have to understand where Daniel and Aaron come from to understand why I reason the way I do. As user (Jack_Zy) explained in one of his many threads, Daniel has the so-called Oedipus complex. Simplifying everything said in those threads, Daniel's complex made him not only feel attracted to Lana, but also developed an unhealthy love and desire for her, but that doesn't take away from what it ultimately is: love. Lana is even mentioned as someone somewhat naive who didn't realize that even her neighbors fantasized about her, and in the first chapters she herself said she could never cheat on Alex. Meanwhile, Aaron saw his mother fucking his cousin, whom he didn't like. Then he saw how his mother, because of his cousin, showed her tits to his uncle at breakfast. Daniel's perspective on his mother versus Aaron's is very different. For Daniel, his mother is something pure that only he can corrupt and possess. For Aaron, we don't know if his mother means much to him, since Aaron is in love with Alice, not Sarah.
Conclusion: Although Aaron may be somewhat similar to Daniel, he doesn't have the same personality or behavior. While Daniel loves Lana, Aaron, for his part, loves Alice, not Sarah. Perhaps Aaron feels his mother is just being difficult, but in reality, he enjoys it, but just doesn't want to admit it.