Zoku Inaka no Kuro Gyaru JK to Kekkon Shita Nichijou

Koichi left the city and moved to the countryside, where he met and married Ichika, a tanned gal. The happy couple have sex even while the kuro-gal was pregnant. After the birth of their child, they resume their happy days full of sex, eagerly trying for a second baby. 

(Source: Melonbooks, translated)