Literally all of chapter 4 was written to explicitly include the a number of facts, among them:
1) She's seen as a woman of convenience, to be called on for sexual release.
2) She regularly comes to him. The fact that she hasn't shown up for some period of time was entirely noteworthy to him, and he felt it important to stress exactly what role her presence plays.
3) She steps in voluntarily, after offering a meager resistance, with the guy who's made it clear he wants her to relieve him.
4) She's kneeling in the middle of the living room despite there being a perfectly good sofa literally one step away; it's actually more work for her to sit down on the ground than it is to sit in the sofa from the start.
5) He's standing in front of her, and pulling up his pants- clearly refreshed by something.
6) She's got something running down her chin.
7) He calls over "the usuals" to drink at his home, and tries propositioning her again. This suggests that "the usuals" might also be in on this, and that Chapter 2.5 was probably canon (It obviously was, but the author doubled down and made a retcon harder- this chapter notwithstanding).
The creator wrote this into the story. There's nothing she can use to fill the blowjob shaped hole she left in this chapter.
Brother, it doesn't make logical sense that the blowjob didn't happen. I respect the attempt at a retcon, but she locked the degeneracy in with chapter 4.
