Ana no Oku no Ii Tokoro

Only refer to 2nd episode of Ana no Oku no li Tokoro, since both have sister in law, both brother in law finally punish their sister-in-law in the end. Both dramatic. 

The strength of family's loyalty is put to the test when sexual desire arises from deep within. The forbidden taboo is inevitable as pleasure reaches new heights thus re-awakening a person from the core. 'Konna ni Yasashiku Sareta no' share a sister-like bond with 'Ana no Oku no li Tokoro' with its character environment and settings. Aside from the similar animation, the woman's frustrating life behind close doors proved too much to bear, leading them to explore beyond their horizon in search of excitement and thrill.