Haha, er, feels kinda awkward being the one who sparked off all of the bullying discussion. I stand by what I said back then, that I would get more enjoyment out of this story if it portrayed a mutual/consensual relationship, but I didn't necessarily want to encourage a censorious environment which would prevent positive discussion of the story later.
Basically, I stand by the statements that parts of Esumi's behaviour definitely constitute bullying. Stuff like forcing Emu to run thirty laps around her school in a swimsuit, or getting soda all over her clothes at a school without a shower, are definitely way beyond the lines of what could be called 'teasing'. However overall I actually found the second chapter to be more palatable than the first one, if only thanks to the greater development in what makes Esumi tick.
On that topic: I agree another poster that the privately arranged outing to the amusement park had the markings of a date. It was interesting to find out that such an outing was what Esumi considered a personal birthday present. Somewhat subjectively, I felt that Esumi's harrassments at the amusement park were less than what we had seen at the school. Most importantly however, I felt that the glimpse into Esumi's home life seemed to present the possibility that she and Emu could develop a more genuine connection (Esumi definitely feels estranged/overwhelmed by her brother's behaviour, which seems to make her relationship with Emu her only tangible/significantly notable human connection). These factors allowed ch. 2 overall to give me a more favourable impression.
I do think it's concerning that, to this point, Esumi has not shown a single instance of caring for/respecting Emu's personal free will or desires. However, I don't think it can be questioned that Esumi's interest in Emu is sexual/romantic, given her description of her response to Emu back in ch. 1 ("arousal"), and the sexual aspect to a fair degree of her harassment (getting undressed, etc.). So, in general the series feels like it is probably slowly/gradually moving towards a romantic relationship, with some disconcerting elements (Esumi's complete lack of concern for Emu's free will) to be hopefully resolved in the future. If that issue doesn't get resolved or seem like it's being developed towards a resolution, then I think that I will set this series aside as a distasteful comedy, but for now I'm still fairly willing to see where the author goes with it.