Uh, ... well, That Was SOMETHING COMPLETELY "W.T.F.". Either that, or it's yet another case of Art Imitating Life, where "... the names have been changed to protect the innocent."
The Itsutsuse universe must be full of women lactating a bucket without pregnancy, men cumming buckets nonstop, the inbred aliens and so on.. and I hate myself for loving it ngl
Like Yamaimo Tororo's Endless Rondo, this chapter feels like a short,
throwaway sequel that (for some reason) completely abandons all the
dark possibilities set up in the preceding chapter---which is rather odd,
because Itsutsuse has shown he's willing to thoroughly explore a dark,
perverted theme. See Inverted Masturbation, which is one of the best
chapters on Fakku.
After rereading the previous chapter, I don't see the dark possibilities you spoke of. Her boyfriend seems to be an actually nice guy that is turned on, unexpectedly, by his girlfriends masochist side. I do agree that it was too short. I had prepared for a full story not just a slight joke title. She is a cumdump in a case. Ha ha ha.
Based on some (very) subtle hints in the previous chapter, it's quite possible
that Asatsuki's ex used to be a nice guy (just like Yasashi), until she "trained"
him to be abusive, in order to satisfy her extreme masochism.
Far from being a pitiable victim, Asatsuki may, in fact, be a sick, manipulative
bitch who likes to corrupt nice guys. Such women do exist.