Sherlock Imagines

Sentiment is a weakness (SherlockxReader)?

This is really sad. So will be the next three. I'm so sorry! Not really
Four years. Seven months. 19 days. That's how old Isles was now. As he stood holding the little toddler was now. And here, at her mother's tombstone, Sherlock held back not only tears, but his little girl's hand. He read over the inscription over and over again, it never made him feel any better.
"You alright, Sherlock?" John clapped his shoulder from behind. Mary held John's hand, looking at the grave of her only sister.
"Daddy, what does this say?" The four year old inquired, looking at the long engraving. He smiled a bit at the perfect saying he chose.
"Here lies Y/n L/n. 1986 through February fourteenth, 2013.' Those little letters and numbers stand for; 'dopamine, seratonin, oxytocin.'. 'The chemical formula for love. Love may be a chemical defect, but it's still chemistry. Still science." Tears welled in his eyes at their old saying. Three years, two months, and 12 hours since Moriarty took away the love of his life. Since he whispered in her ear, telling her something that absolutely disgusted her, since he gently kissed her cheek as he stared Sherlock down... Since he shot her. Killed her. Flashes of the memory played out in his head, time and time again. Her standing proud as the nuzzle of the gun dug into the tender flesh of her temple...

~Flashback cuz I'm evil~
You stood tall, as you waited for Sherlock to come. Moriarty's left arm laced a little too tightly around your 'waist', a little too low to even be considered your waist anymore. Running his gun to caress your cheek as you patiently stood your ground. Every once and awhile tucking a few loose strands behind your ear with the nuzzle, saying things like;
"Wouldn't want to hide that pretty little face."
Or
"Don't hide, I like looking at your face, kitten." It was absolutely disgusting. It seemed like a decade had passed before Sherlock arrived, and he was met with the sight of his darling wife kissing his arch nemesis. For a split second he was heart broken. Didn't take him long to notice the gun pointed at her, realize his mistake.
"Let her go, Moriarty!" He shouted hastily to the Napoleon of Crime. Moriarty stood you back up sweeping the gun quickly back into your temple.
"Sentiment puts you at such a disadvantage, Sherlock. I wonder how love actually feels, care to share? I mean, don't get me wrong- little y/n here knows how to turn a guy on," Sherlock visibly cringed at the thought, "All she's gotta do is walk on by, and- BAM! Fascinating. Really is. But love? Mm, no." He didn't let go, but he did move. Whether it was the gun, or his hand, or pulling you closer into him. Filthy. He leaned his lips into your ear, making sure his eye contact never left Sherlock.
"If we had more time, Darlin', I'd be happy to show you what I've got going on in the big bad world, but it looks like you'll be visiting somewhere only the dead dance. So~orry!" He sang the last part light in your ear, the entire idea making your skin crawl. Desperate to be back in Sherlock's arms, holding Isles. To be nowhere near this madman. His lips touched tenderly to your cheek, causing you to attempt to jerk out of his grip. Only to be brought closer to him.
"She's feisty. I like it. I like it a lot." He said in almost an admitting tone, but you had one last thing to say.
"Sherlock! Remember, always remember. I don't care if you believe it! Tell Isles, and remember; love may be a chemical defect, but it's still chemistry. Still science, Sherlock! Dopamine, Serotonin, Oxytocin! Sherlock, you can overdose on all three and it'll drive you insane, but that's what love is! It's insanity!"
You spilled out, quickly trying to give your last moments meaning. Tears streamlined down your s/t cheeks, and all you saw in Sherlock was pain.
"Aw, isn't she sweet? Smart, sweet, sexy. Too bad it's all down the drain." The gun went off as he sang the last word. You were dead before you heard Sherlock cry out in agony, before you heard him firing round after round into the criminal. He lost you, forever.

~End of flashback~
Tear after year slid down the high arch cheeks as he remembered her last request. The last thing he'd do is forget it, no matter the pain.
"Why're you cryin' papa?" She tugged on his black trench coat. The only real time he wore it anymore was when he came here.
"Because Isles, I loved your mother, and I miss her dearly." He bowed his head as more tears began to flood from his eyes, as if the dam to his emotions had somehow burst, letting all the pain and sadness out with it, but also the love.
"Daddy, what is love?" Little Isles asked. Sherlock bent down to her level, quickly regarding the tombstone.
"Love is the chemicals Dopamine, Serotonin, and Oxytocin when one finds a certain being. Overdosing on any of them can lead to insanity. That's alright though, because love is insanity. Love is the greatest chemical defect."