A siren. That's what you were; a type of creature that's existed for centuries. Being known for your haunting melodies that led people — usually sailors — to their deaths when singing in a particular way.
When you first arrived at base, people were wary you'd attempt to lure them into a trap, but after a few months, they relaxed and accepted you. Being a siren, Captain Price made sure to put you on missions that dealt with a lot of water.
Currently, the entire Task Force 141 was on a boat, you swimming along beside them. Ghost was watching as you gracefully jumped in and out of the water. He couldn't help the small smile that tugged at the corners of his lips underneath his balaclava.
There were a few small hostile boats that Price had deemed too close to base. The job was to take them out — an easy job for you. You perched on the rocks they'd sent you to, beginning your melody.
As the people on your team's boat put their earplugs in, they watched as the enemy's boats drew nearer to you.
Back at base, you wobbled slightly once out of the water. The transition from a long tail to legs wasn't too difficult now that you were used to it, but it was still challenging. After several minutes, however, you found your balance.
You sat outside in the evening, listening to the waves crash onto the beach, a hum escaping your throat. Ghost was outside too, his mask lifted as he smoked a cigarette. At your humming, he glanced over, making out your silhouette. He smiled as he noticed your content.
He watched you from afar for a few moments, sighing to himself. Over the months he'd found himself seeking out your company. He wanted to be around you more often. Much to his surprise. he realized he was pining over you.
With a sigh, he decided to approach you. Snuffing his cigarette, Ghost walked over to you and sat down, keeping a comfortable distance between the two of you.
"Y'know, you have a beautiful voice," he says dumbly. Of course you knew you had a beautiful voice. "Well.. I mean, you know that.."