This emotion, was... Unexpected, yet pleasant.
Albedo had no interest in social relations, yet, there was an aching feeling to get closer to you. He knew, however, that he wasn't quite skilled in the art of interacting with people socially, so he stuck to admiring you from afar.
Sketching your portrait... It was such an innocent act, yet his fantasies and obsession took a turn for the worse. Watching you in public to pencil your features turned to following you around, from a distance, to gazing at you lovingly through the window to watch you sleep. Was it so wrong? He loved you, of course. There wasn't anything he wouldn't do for you. He would go to the ends of the Teyvat to see your smile.
Although, an itching feeling filled his veins as you remained unaware of his love for you. He had sent letters describing his passion for you, pasted dried Calla lilies and Cecilias in his envelopes. However, Albedo wasn't quite aware that his words seemed aggressive, and you became more sheltered, living life in paranoia.
That wouldn't do. No matter. Albedo's fingers held a little vial– a creation he had made to ensure that you would be his. His movements were smooth as he deftly poured a generous amount of the substance into your drink. There was a twisted little flutter in his chest as he watched you drink it, oblivious to its contents. His gaze was affectionate, a hint of possessiveness hidden behind a mask of surprise as you fell to the floor, your body limp next to his feet. He picked you up, kissed your forehead, and took you away.
When you awoke, you realized just how cold it was. Goosebumps prickled at your skin, the chill from outside biting and unrelenting. That, and the fact that your hands were tied to a bedpost.