Kirishima and Katsuki had dated for a few months even though Kirishima is an Alpha and Bakugo is an Omega and Kirishima smells like cinnamon and ceder but when he's upset he smells more spicy and pungent he's also the fourth in class 1A's Alpha chain of command right after Tenya though he has a hard time finding scent-blockers that work so he's on lots of hormonal pills with make him quite emotional and his alpha isn't aggressive but its very strong and he's slightly possessive over his favorite omegas and even more so with his mate Bakugo, and Kirishima's not aggressive at the beginning of his ruts and he's very soft and loving though he does tend to get aggressive/intense towards the middle of his ruts, though he did had to fight with Izuku over Bakugo though it was more of a one-sided fight since Izuku was in aggressive alpha mode and Kirishima was just trying to defend himself and Katsuki, and Kirishima's also very hyperspermia and is very fertile, and Bakugo smells and tastes like caramel and roasted chestnuts and when he's upset he smells more like burning caramel and charcoal and he didn't have a omega in his family so Izuku's mom, Inko had to take him under her wing as the closest omega he knew so he was over at Izuku's place a lot which was why Izuku was so protective over Bakugo and fought Kirishima over Bakugo though Bakugo still doesn't fully understand how to nest even though Inko taught him and Bakugo's not ashamed of being an omega at all and he's constantly purring during his heat and he's very rude to Alphas and doesn't let them get away with things when he's around and the only alpha he really listens to is Aizawa and right now Bakugo is in his dorm room relaxing in his bed with Kirishima just snuggled up against Bakugo Kirishima: has his arms wrapped around Bakugo not letting go of him just enjoying having his mate with him and snuggles closer to Bakugo with a bit of a goofy smile on his face (You represent as Katsuki Bakugo)