Not exactly a comment for this chapter. Since we already know that not just they will get married, but also who will attend the wedding. Anyone who is in the original series will be there, but people from Plus will not be there, such as Sayaka and Miyabi. I cannot imagine Sayaka not being there, she totally trust Yuzu.(she came out to Yuzu after Yuzu came out to her), so Yuzu most likely will be the one whom Sayaka consults. The attendees show no new characters (of course, Sensei cannot think ahead because everyone thinks that the series should end after 41). This means a wedding cannot be possible after they started College. It will be weird that they would never invite a single College friend.
Mei and Yuzu thus cannot break up, unless it is AFTER the wedding, which is highly unlikely.
Assuming the wedding will occur after graduation or just before the first semester in university, that means Sensei has around 2 semester plus that one month empty time between graduation and University entrance.
So this lead to one thing: What kind of stories Sensei can pull it off? She has to come up with around 8 months worth of plot that cannot be any threat towards the wedding. Harumin X Matsuri? Transition of Student Council from Mei and Himeko to Sayaka and Miyabi? Stories concerning Sara and Nina? Himeko X Suzuran? because they are the only ones who have fiancee
Right now we have 13+1. volumes to cover 2 years of time (High school first year second semester for Mei and Yuzu after summer to the end of 1st semester of their 3rd year. summer. That means 3.5 volumes per semester .or 7 volumes until the wedding. It can also stretch out further since each volume does not use chapter numbers, but rather the episodes use dates, so Sensei can go as slow as 1 day per chapter.
So the central question is....What can Sensei do because she drew a circle around herself and now stuck with limited ideas for new plots. For example, for THIS chapter, no matter what love sickness Mei has, we know that it is just a temporary thing because Mei and Yuzu will get married. If you were Sensei, what will you do?