Hi everyone, i've been writing fanfic for a while now, but this is my first A/B/O verse. To be honest I've only just discovered this trope and I've found it fascinating, so fancied a go at writing one. I can't say I know everything about this style of writing, and I know I have definitely moved away from some aspects of it on purpose. I hope you like it and would love any comments, constructive criticism about it. Thanks. Mrs-E x

Chapter 1

"Hello, Mr Barnes I'm Dr. Martin. Please, come in and have a seat."

The young doctor stood by the door to her third storey office and gestured towards a comfortable, low green sofa. Elizabeth Martin -or Tessa as her parents affectionately called her- was a renowned psychiatrist and an employee of Stark Industries. Originally hired by Pepper Potts to counsel Mr Stark, but who now led a team of professionals that looked after the physical and mental well being of the Avengers. A revered doctor, Tessa was renown for her acute mind and fair assessments of her patients. It also helped that her presentation as Omega made her affectionately supportive and naturally willing to help the team members around her.

Bucky took the offered seat but sat down begrudgingly. Since his return to the U.S from exile in Wakanda, he had been subjugated to endless interviews, analysis and tests. Each one to determine whether or not he was still the threat that his former persona was. He couldn't begrudge his would be employers too much, he had done unspeakable things under the direction of HYDRA. However since his 'convalescence' in the African country he was a changed man. Dr. Martin was the sixth Doctor he had seen that week and he had had his fill of them. But like the good boy he was deep down, he sat graciously and waited for the brunette to speak.

"So Mr Barnes…"

"Please call me Bucky!" He interrupted trying to appear familiar.

"Would you feel more comfortable if I were to call you that?"

"Er no, It's just, I thought it might make you more comfortable." He stammered.

"Why do you think that?" She replied whimsically.

"I...um," Bucky faltered.

He looked at the doctor from a sideways eye, and it hit him. How could he have been so stupid. This was textbook psychiatry, answer a question with a question. Bucky looked over the Doctor thoughtfully, analytically and it hit him like a bullet right between the eye. She was an Omega. The former assassin shuffled in his seat as he subconsciously inhaled her scent. It was subtle, sweet but suppressed by the vaporiser sat on the bookcase behind her. He focussed hard on distinguishing her scent from the Arabian spices slowly leaking from the vaporiser. Warm white amber, sandalwood and Indian Jasmine, his Alpha senses told him triumphantly. Her scent was intriguing making Bucky slightly unnerved.

Doctor Martin noticed the change in Barnes posture and caught him looking at the small white machine behind her. She smiled calmly and explained, "A necessary tool Mr Barnes. But completely harmless."

The hungry Alpha calmed somewhat and smirked coyly at the doctor, "Bucky."

"Very well Bucky, shall we begin?"

Bucky played along with the Doctors assessment, after all he knew he was physically fit for work in the field, he just needed her signature to agree he was mentally sound. Their interview took over two hours and by the end of it Bucky was hoarse and extremely uncomfortable. Despite feigning acquiesce to the conversation at first, he had found himself opening up to the doctor more than he had anyone before. Except maybe Steve. There was something familiar about the soft lilt to her voice and more likely her scent, that seemed to waft into his senses everytime she moved her feet or changed position in her chair. The rational part of his brain surmised it was her job to get people to open up to her, and thought nothing more of it.

As the soldier finally turned to leave he pulled the office door open wide, happy to inhale the clinical smell of disinfectant in the hallway. He asked the doctor candidly, "So Doc am I fit to work?"

Dr. Martin looked up from her papers over thick rimmed glasses. She pulled them from her slender face and folded them contemplatively in her hands. The psychiatrist took a deep breath and answered tactfully,

"I'm not finished with my assessment yet, Mr Barnes."

"Not finished? We just spoke for about two hours!" Bucky shot back a twinge of anger in his voice. Truth be told it wasn't complete anger, it was mainy frustration amplified by the fact her scent had not alleviated in that time.

"Yes, for my initial assessment. Mr Barnes, I like to get to know my patients before I recommend treatment."

Why did I just say that? Tessa thought inwardly.

"I wouldn't be doing my job correctly if I based my results on this conversation alone."

"So what does that mean?" He sighed.

"I'll see you again in 4 days, same time. Would that suit you?" She said placatingly.

"Sure, thanks."

Bucky's reply was dripping in disdain and he left the doctors office deflated, slamming the door slightly harder than he had meant too. It had been some weeks since Steve approached him, asking him to join the Avengers and he was getting nowhere fast. However, he was determined to prove everyone wrong that said, he was nothing more than the killing machine he was brainwashed to be.