First, a slight language/TL note: On page 9, where Fran-sensei says "Sometimes I even impress at myself", that's not a good construction, I would suggest "Sometimes I impress even myself" as a better, more natural way of conveying what she means.
Second, man I just love these two. I can totally understand why Mimi couldn't keep away from that little bottle, but damnit be a little more careful. But that's just not how she is. And Sheena through the end of the chapter hits right smack in the feelings.
So, great chapter. Fully managed to forget that cloud of dread hovering perpetually above while reading it and that's good with me.