Pls.... help... T^T

Does anyone know this yaoi?
Theres this guy who had an affair with a "housewife" (which is the seme) but then they got caught by the husband (uke) and so the married couple divorced and the guy who had an affair got troubled that it was his fault... so he came to apologize to the guy and said he would "do anything" and the final blow came: the guy (who had divorce) said it was nothing of a deal since from the start he had nothing to do with the woman (or somewhere that thought XD) and they had sex... after that he called himself somewhat like "BUTTERFLY OF THE NIGHT"
┗( T﹏T )┛.. Im desperate to find it!!