Eri’s feelings are funny. In one chapter she’s pushing Fuyuki away, saying that she likes her, but in a totally-not-gay-way. Then, in this chapter, she’s repeatedly hung up over the thought if Fuyuki was attracted to other girls. This chapter is a lot more explicit about her feelings being romantic, but it’s intentionally mysterious; is it monopolizing possession or “I can see myself in a physical and emotional relationship with Fuyuki”? I’m sure she’s confused as much as we are.
In all honesty...the fact that this might be the first time Eri has seriously tried to put herself in the shoes of someone else, scares me intensely in regards to Fuyuki.
I'm not saying that it's too late for her to learn and grow, but...second year in uni? That's
old, to suddenly decide you should maybe try and develop a sense of empathy.
And the bigger issue is just how blasé Eri's been about every relationship in her life, including with Fuyuki. Sure, she's the most important person to Eri, but after their childhood time, it comes across as incredibly selfish and self-serving. Eri might have been the "helper" when they were little, but the moment Eri was in middle school and her personality and unintentional insensitivity started really affecting her social life, Fuyuki became the parent & caretaker, and Eri just......took it all. Made all the worse by Fuyuki's developing attraction, that she could never voice for fear of losing Eri forever - because on top of the sexuality incompatibility, Fuyuki had a front-row seat to how Eri treated every relationship she'd been in.
Basically, after <Confession>, Eri will have to go
all in and fully, consciously commit to Fuyuki and making this work, and it needs to not be for the sake of "monopolizing possession", as you mentioned. I do think Fuyuki's probably irrevocably changed by what transpired between them, and if it can be repaired, it will require more from Eri than she's ever shown she can do to this point.
For the sake of Fuyuki's happiness, I hope she's up to the task.