Momoiro Shinkon Seikatsu: Danna-sama kara wa Nigerarenai

A newlywed life with a childhood friend from a noble family. Unspeakable love is taught through kisses and caresses... "As your husband, I will teach you about how a man and woman join together." The intensely passionate newlywed life of a nobleman and a young lady has begun! Anastasia, the daughter of a marquis from the Resnia Empire, married Duke Sergei, her childhood friend nine years her senior. Anastasia worries whether she is worthy of being the wife of this nobleman whom everyone admires. "I'm the luckiest man in the world to have you as my wife." Throughout their marital intimacy, from their wedding night onward, Sergei showers her with sweet kisses and caresses. Anastasia's love for him grows, and she wants to be a good wife to Sergei. But then, suspicions of his infidelity arise...! (Source: BisouBisou Comics)