This really hits all the notes of your classic netorare. But I like this one most because the husband actually gives permission at the start. But the wife just falls in love with the new guy (husband's brother) so deeply that she's closer to a cock slave than wife. Check this out if you love creampies, ara ara or broken minds.
Usually I'm way into this. But something about that being a good, well meaning big brother who just wants to find love... I felt very conflicted when I came that second time.