I guess it's possible, I wouldn't like it because I would consider that chapters 2, then 3 which introduce interesting couples: pervert x pure girl then president x vice-president would have given us expectations (personally I love the Aoi x Kanna).
It's a really short manga, so yeah I will feel betrayed if it goes in a polygamy direction even if we stayed with only one chapter that shows the couple I like the most having a nice chemistry between just them (chapter 3).