Well, if you truly skipped reading the entire chapter, then you probably missed out on some of the reveals from the context in it.
I honestly was wondering how Sue got into BDSM in the first place, and this chapter shows the surprising and unexpected introduction to it. From there, we learn (or maybe I'm wrong with this thought) that this newfound sense of "dominance" helped fill the satisfaction that Mel could never really fulfill no matter how much love she gave to her (and she had alluded to this in an earlier chapter).
The ending conversation was also a very sweet moment between Mel and Lynn that is starting to show the reality of the situation regarding the surgery. Lynn's a bubbly and compassionate individual, but deep down she knows the severity of her condition and the possible outcome, and it probably makes her a little insecure with believing whether she's "good enough" for Mel despite Mel making it clear over and over that she loves Lynn from the bottom of her heart (something she thought she'd never be able to do again). Lynn probably feels Mel could go and love anyone else in the world, but chooses to stay with her despite being so close to death...and that's what makes their relationship so beautiful.
I love the storytelling in Pulse, but sometimes I feel that some readers (not calling out anyone specific, just generalizing) are only invested in reading for "hot sexy scenes" and forget that there's even a story being told. I mean, opinions and negative feedback are totally fine, you don't have to enjoy a chapter or the story itself...but I don't think there's such a thing as "the worst chapter" when it comes to this story because all the scenes have had a purpose in driving the plot and characters together.
I for once was never interested in Sue's life whatsoever. I knew she is a bitch the first time she was introduced. And when we were told how easily she left Mel for that guy, my remaining 0.1% interest in her character was lost. She can die in a hellhole for all i care.
I still like Pulse but i hate that bullshit chracter. And will absolutely skip the scenes she is in. I don't care if they had BDSM or sex scenes, as long as she is there in skipping is there.
And what was the point of creating that bullshit story of how a deceiving bitch got into BDSM? Just waste of time and pages. I wanted to read how Mel is going to do operation of her lover rather that shit character.
If you think there is no worst chapter in a manga or book, then you must be new to reading stories.