This manga has two versions: Josei and TL, the TL version has been licensed in English.

There's no greater pleasure than being consumed with love from the one you've always longed for... if only such moments could last forever... Sakura Hazuki was summoned to an another world 10 years ago. She was forced to the role of a saint, and finally managed to defeat and purify the Demon Lord. As a reward, Sakura wishes to marry Julius, the knight escorting her, but there is another purpose behind her decision, one that concerns the safety of their entire world...! Come their wedding night, despite his usual taciturn and cool demeanor, Julius gazes at her with eyes filled with passion... and with deft fingers and a talented mouth, Sakura feels molten pleasure building within her for the first time ever in her life... In a world filled with profound magic and deadly swords, their love might just be enough to save everything.

https://mangaplaza.com/title/0303008954/?order=down