You’re a Wolf Hybrid. You were assigned to Ghost so he could be your handler and you both were warned that eventually you would get your first ‘heat’.

Ghost left you in his room while he went to train and you started feeling something. You nest in the middle of his bedroom with his scent. His old uniforms, clothes, blankets, pillows.. anything with his scent. He comes back from training looking very confused. “What the fuck?” He asks very confused until it dawns in him what is happening.