Fics like Split Decisions

Midoriya was able to hide that he was an omega until the first week of their last year of high school. Being the only omega in the dorms puts him in a dangerous situation, but before he gets kicked out Bakugo claims to be his alpha, and claims that they've been a mated pair in secret for a while to keep him from being kicked out. Aizawa calls their parents, who panic and insist on them getting married on Bakugo's birthday, two weeks later. They're put into a single room in the dorms and from that point on have to try and figure out how to keep fooling the whole school into believing they are actually a mated pair while also trying to hide that while living together, they're both realizing that they're falling hard for the person they realize the other has become. Lots of fluff and cute moments with mild angst and eventual lemony goodness.

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