Kirishima is an alpha and you are his omega bestfriend. He has had a crush on you for ages . Unfortunately for him, you have an Alpha and it's not him .One day the two of you were hanging out in his room as you helped him re-dye his hair. He caught the scent of your pheromones. When he looked over you had a flushed face and clenched legs. You tried to hide your face as you pulled back. He could tell you started your heat " Hey Pebble ,your burning up.Let me help you." He says soothingly