After her sister past away, the uke have been living with the seme. For years, he has been developed feeling for his brother in law that only live with him because of the thinking that the uke would be left alone since his parents were both died. He knew that the uke had a feeling for him for a long time because it was obvious, however, he remained silent and ignore it due to the respect for his wife. Until one night, when he got drunk, he said something to the uke that made the uke hold for the hope that his brother in law would like him back. And when he got home, that was the time his brother in law confessed his feelings for him. Due to the thoughts of them betraying his sisters, he decided to avoid his brother in law but that doesn't last long cuz they realized that they can't control their feelings for each other. At the end, they lived and love each other. Actually the seme already confessed before he got drunk. He said that the moon is beautiful couple of times but the uke was to dense to realized it.
Ani no Senaka