My Dear Grand Duke on a Leash

Seduce a man you just met and marry him in a week?

On the eve of her sister's wedding, Princess Liët of Chalonne meets the imperial prince sent as a congratulatory envoy. But instead of gifts, this prince delivers a threat.

*“Marry my cousin, Cain, and uncover his weakness.”

“If a princess about to marry were to pass away... wouldn't that be a tragedy?”*

To protect her sister, Liët attempts to seduce Cain, the Iron Archduke known as an ice pick, an artificial being. But she hits a wall from the start.

“Please refrain from approaching me.”

Cain effortlessly deflects all of Liet's efforts. Eventually, Liet even proposes a contract marriage, determined to become his wife...

“You seemed quite exhausted last night, so I'll be gentle today.”

The impenetrable fortress that was Cain vanishes without a trace, and he begins to cling to Liet like a dog...?

(Source: Ridibooks, translated)