Simegsposiguro
Izuku is an omega born without a scent - a rare, "defective" trait. Everyone assumes he's a beta or useless; he's invisible to alphas, can't form bonds, and is treated like a ghost. Bakugo is a dominant, aggressive alpha with hyper-sensitive senses - he can smell emotions, lies, and even intentions. Only he can smell Izuku - and to him, Izuku smells like sunlight, rain, and burning sweet caramel - the most intoxicating scent he's ever known. He's confused, angry, and obsessed, because no one else can smell it.
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Cross-posted on Ao3!