MerrickM's manga / #It doesn't have an ending???(1)

Plot: A dude's wife disappears so he takes his twin kids to her brother, who he used to tutor. Brother acts like a mother for the kids for 2 years and the dad is basically a wanker. The brother always had a crush on the dad and the dad had a crush on the brother I think? The wife is missing but nobody looks for her and nobody is even a tad concerned? at the end they fuck.the end.