Open hearts, Closed minds

"Yes, Tony, I'll be there soon. Tell Buck not just start without me." Steve Rogers aka Captain America, trotted through the alley to wear he had parked his beloved motorcycle.
He froze when his nose twitched, picking up a female omega's heat scent. His gold ears, perched atop his head like an animalistic crown, perked up and his long, fluffy golden tail rose to curl at his side.
He turn to the left as he caught the scent again and a very small almost undetectable whimper. The scent was that of a predatory feline, exotic and spicy but something was wrong. It smelled metallic, like copper or blood and a scent marker like that only meant something had happened, something horribly wrong.
He slowly moved toward the scent, to find a silver haired young woman. She was thinner than she should have been for an Omega and a feline at that. He couldn't tell what species she was specifically, only that she was a large species.
She was curled up on her side holding her abdomen, she was obviously in a great deal of pain but Steve couldn't see or smell any blood.
He picked her up in his arms and straddled his motorcycle with her in his lap, it was complicated but he managed to make it to the Avengers tower in decent time. As he carried her into the elevator to go to Bruce's labs, where he could look her over and make sure she wasn't severely injured, she woke up.
"What's your name?" Steve asked in his No-nonsense Concerned-alpha tone.
"Ch-cherok-ee..." Was all she could say before falling back into unconsciousness, limp in his arms, yet again.

Why is my head pounding so hard? And why do I feel so empty? I thought as I finally came to in what looked to be a lab.
I sat up, the ache in my abdomen returning full force.
"Ah!" I called out, pressing against the pain as it started to spread. "H-hey! You! Oh god, it hurts!" I tried reaching out to the dark haired, Ursine Beta a few feet away.
He turned towards me, eyes wide and hands trembling.
"You're awake? Oh God, you're awake." He turned to grab what looked like a walky-talky, and spoke into it. "Steve, the girl you brought in earlier... she's awake."
"I'll be down in a second." Came the response.
"Okay, but she's in heat, and it looks like a bad one. When you get down here, we need to talk about a few things concerning our guest."
"Okay."
He set the walky-talky down on the table and turned to me, with a syringe in hand.
"This will lessen the pain you're feeling. Okay?" He had a gentleness about him I couldn't help but relax into, as he wrapped his hand around my left forearm.
"Okay." I grunted in reply, with an affirmative nod.
He pushed the needle into the vein in my left arm, it hurt but the concoction made the pain dissipate almost immediately.
"There, better?"
"Yes, thank you. Do you know why I'm here?"
"Steve brought you here. He found you curled up in an alleyway in the city." He said, probably just as confused as I was.
Suddenly, the door behind me opened, startling me into a full sitting position. I still had my arms wrapped around my midsection protectively, unable to fully analyze the situation when that deliciously strong, smoky Alpha scent wafted toward me. Following that scent was an All-American looking, dark blonde Adonis of epic proportions, and I was most likely drooling.
"Hi. You're Cherokee, right?" He asked, his ears perked up, his left slightly falling over.
"Y-yes, that's my name. Why did you help me?" I have never been more aware of my heat, and I felt like I was slowly descending into madness.
"You were in heat and in pain, I couldn't leave you lying there without knowing you were okay." He smiled at me, the warmth from that smile spread through me like a soothing blanket from head to toe.
"Thank you, but I can't remember why I was there. I... I just can't, no matter how hard I try." My head started to hurt again as I lay down on what I now realized was a cot.
"Bruce, you said you had something interesting to tell me." He moved away from where I lay, head into the other side of the labs. The last thing I heard before blacking out, for the third time in less than 36 hours, was a few grumbles and a gasp.

"What do you mean, she's a 'Griffon', that's not possible. Cross-species breeding between Avians and Felines are supposed to be pure myth, and you're telling me we have a fairy-tale in the other room?" Steve barely managed to stay within a whisper-like tone, barely.
"If that's what you want to call her, then yes we have a cross-species fairy-tale asleep in the other room. One thing that bothers me though, is that she has a healed bond mark." Bruce was staring at her vitals and bloodwork as if the answer would lie there somehow.
"She has a what? Bond marks don't heal, not unless a bond is broken and that only happens when a bond mate dies." Steve began to pace, as was his way of coping with things he didn't understand.
"This is 2016, not 1940. Steve, there are ways of breaking the bond but they are extremely painful and can have major consequences. They can only be accomplished by an Alpha, though, which makes it that much more traumatic for the Omega. She could be sterile, paralyzed, have psychotic breaks, uncontrollable transformations, amnesia... the list goes on. That's why it is forbidden to use those kinds of measures." Bruce looked back at the girl, tossing and turning restlessly. "She could have a psychological fear of Alphas now, and we have no way of knowing unless we keep her here for observation." He looked to Steve with hope in his eyes.
"If that's the only way we can know for sure that she is okay, then she can stay with us, since we have the only other Omega living up there." Steve sighed, pinching the bridge of his nose. He had no idea what he was in for, because what Bruce didn't tell him is because of the bond being broken she will go into an extreme heat. She needs a mate, or mates if they were lucky.