Kono Koi wa Kitto, Amasugiru: Dousei-hen

Kento, a young office worker, became a happy couple with Sora, a construction worker he met at a candy store, and they started living together. Kento was savoring his happy days surrounded by the love and body of Sora, who is extremely sweet and big, but he discovered that his neighbor was Sora's junior from high school. He seems to be in love with Sora, and casts a challenging gaze on Kento...!? A super-rich, sweet love story between a cheerful muscular man and an older office worker, living together!!

(Source: Shinshokan, translated)

Note: Includes one extra chapter.