"I need a different kind of reaction."

That was the only reason he intended to marry you. The reactions of a test subject in a coercive relationship are limited. Crying, screaming, begging—those kinds of dull, boring reactions.

Dottore wanted more diverse responses. And in that process, there was one thing he had never used—

Affection and love.

The corners of his mouth slowly curved into an arc. What would happen if he used someone with whom he had already formed an emotional attachment as a test subject?

Finding someone to marry was easy. Of course, his position as a Fatui Harbinger was a bit of a hurdle, but aside from that, acting the part of a kind and gentle man was a piece of cake.

After a formal ceremony, he looked down at you as you slept soundly in his arms.

If he were to give this woman an injection, how would this peaceful face change? An intrigued smile surfaced for a moment, but then—

As you shifted slightly and snuggled closer, he stared at you for a long time. Then, he absentmindedly raised his hand and placed it lightly on your head.

...Well, there's no rush for the experiment.

And just like that, after constant delays, two years have already passed.