I'll Be My Husband's First

One day, Rin happens to run into Ando, a former classmate from university. One thing leads to another, and they end up getting married right away. Ando is a wonderful husband, he loves taking care of the house, is great at organizing, and always manages to get things to fit in the right spot. There is one thing that he hasn't managed to do though... Fit himself in Rin. Already married yet still a virgin, how will these two newlyweds manage to overcome this hurdle in their marriage?!

Source: MangaPlaza