Migawari Konyakusha na noni, Gin Ookami Heika ga Doushitemo Hanashite Kuremasen!

Also known as: 身代わり婚約者なのに、銀狼陛下がどうしても離してくれません！, Even Though I'm a Substitute Fiancée, His Majesty Silver Wolf Won't Let Me Go No Matter What!

by Makoto Miyano, Kanoko Kurita

Iris, the daughter of a count, was forced by her sister to go the royal palace in her place, as a fiancee for the tyrant king. The king, who is supposedly cursed with the blood of the silver wolf and is rumored to be a beast himself, will surely bring the kingdom to ruin!? Iris is determined to make it through somehow, but she ends up spending the night with him! Iris thought she was in a desperate situation, but the vicious tyrant is cuddling with her like a big puppy dog!? "It feels good when you pet me, just like that." Maybe it has something to with the legend of the "Moon Priestess"… (Source: ComicWalker, translated)