Despite being a darrell enjoyer I have to agree that this dynamic has gotten a bit stale. Another sex scene with more of the same is not really gonna cut it (for me), unless something new and exciting happens, something that might tilt the story or push it forward into new scenery it will feel flat. Putting in a generic sex scene with Darrell in Nat and Ethans dusty bedroom yet again to quench some peoples thirst won't help much. Unfortunately this is one of the problems with having so many different paths and storylines, in order to make it cohesive and workable you need to make sure many of these scenes can fit into multiple paths, and as a result some of it will feel quite bland and stale, using the same characters instead of new ones to make sure it makes sense within multiple paths, rushing the pacing of a sex scene because the path has been neglected for a month or two, so the fans are yearning for something juicy when it's time for their favorite path to get an update.
And as a result the story/tension/build up will take a backseat. This is not an attack on the developer, he is doing an impossible job for a single person. It's kinda like putting together multiple puzzles at the same time with pieces that don't really fit together but you just have to make them fit somehow, while at the same time having different people telling him to put more focus on their favorite puzzle and ignore the others, good luck.
While I agree that one of this games biggest strength is the sheer amount of paths and choices you can make to tailor the experience after whatever kinks you fancy, it is also one of the biggest problems when it comes to the writing and the potency of the storytelling. But at the end of the day it is a multiple path porn game and it's doing a pretty good job at that.