I’ve been holding my tongue since I read the Spanish version of chapter 11 part way through the last discussion, but now I can talk about it. Whether or not readers approve of the chapter, this is very revealing in terms of Misa’s motivations.
HitsujiMary was really onto what was happening.
“...I don't know about you guys, but I think Misa's just resolving the inherent emotional conflict of the situation (both from Io from having been assaulted and from Misa's jealousy) by giving Io an actually good, consentual sexual experience.
Sure, it's messy. Sure, she didn't ask how Io was. But it fits both of these characters perfectly. I know it can hurt if you've been in a similar situation, but the point of fiction like this is to portray a particular fantasy with a particular set of rules/logic and expectations- and in this case, this chapter fits perfectly with the expectations that have been set.
It's toxic yuri after all.”
Except not exactly consensual, lol. But it makes sense.
Misa feels jealous and is possibly afraid Io might have enjoyed it on some level (like Gabinomicon speculated)
Misa worries Io might be seeking Misa out due to how bad Io’s situation is. The fear is that Io could be putting up with her due to a lack of better option.
Misa wants to be able to help Io, but couldn’t do anything to protect her and will have to send her back into that dangerous situation. This would have been very disempowering for her.
If the stuff with the manager was completely nonconsesual / not enjoyed, Misa is frustrated with Io for being passive and not stopping it, eg, letting the manager get in a second hickey like Suimasen Scans mentioned. If Misa can’t protect her, she wants Io to at least do whatever she can to protect herself.
Misa is aware Io may feel guilty about what happened, especially if Misa criticizes Io for being passive.
Misa’s impulse here, since she couldn’t undo what happened, was to teach Io to stick up for herself, to cover what happened to Io with an even more memorable experience, and then let Io know all was forgiven, thereby cleansing Io in a way. Then she gets carried away in the act, as she tends to with Io.
That’s not acceptable from the perspective of real world morality. I think it does make for an engaging story with consistent characterization.
I don't think any of this makes Misa a good person, and good person for Io, or any better than the manager.