I agree we need content with Carl, Peter, Riya and Jenna, Vance would be worth to reintroduce.
But wishing for more Darrel content?
The guy is fucking Nat most of the time, I guess there 75% Darrel content is in the game already.
The dev should make one last gang bang with Darrel as Nat's pimp and get her pregnant and then let the route fade out.
The other interesting option would be, if Riya get's introduced to Darrel and Ethan has to witness it, or finds out about it in Darrel's online blog.
I want see Nat takeing Carl's virginity and Ethan gives them instructions/advices, specially to Carl, because he needs to learn how to please a woman.
Then we have Peter, the former porn star, he should get his final shot or porn shoot.
Carl is a incel cuck, after watching his crush being railed by Matt, and popping a boner (which is why he ran away from Nat) as he's ashamed about it. Ethan will coach him, arranging a live shoot with Darrel and Nat for Nat's OnlySluts stream, watching it in person. Ethan asks Carl to clean up the aftermath, saying it is the only chance to be close to a woman of that caliber.
or
Carl is secretly packing an extraordinary package, but he's so shy to reveal it in front of the girls he likes. Nat teases him with a lap dance in Nat's and Ethan's apartment, he gets excited thus leading Nat to discover his secret weapon. Ethan grabs Nat's phone and tells Nat to pop his cherry while he videos it. They give the video to Jenna, and she insists doing a live stream with him. Then Peter watches Jennas' live stream(which he always does) and calls Jenna about her new stud. Peter shows it to his old colleagues, who are still in the business. After that, Carl becomes the biggest male talent in the porn world.
Later on, Ethan introduces Carl to Riya...
As much as I'd like to see Vance's subplot again, I think that ship left port.
About Darrel, face it, he's a one-dimensional character. A rich narcissistic jock, fucking married women for his fun. Maybe he could be a secret agent working for MI7 or Mossad, or something... He's soft on Nat, sure, but a candidate for an LTR, I think it's highly unlikely.