Hikari's manga / #omegaverse(3)

So this is basically an omegaverse but it takes place before they discover that there are A/B/O, heat suppressants and bonding exist. The 2 main leads don't realise that they are actually a fated pair because the concept of fated pairs doesn't exist yet. It's interesting because I never seen an omegaverse with a straight couple and a story that takes place before they discover everything that is used in other omegaverse stories.