Sugoi Hentai 
Mama Katsu Lusts After a Married Woman
The nearly imminent Mama Katsu is rather clear in conveying its premise as it involves a male hunting after his older sister and using her for sexual relief, bound to prove entertaining for those who enjoy girls with glasses that are also more mature.
The PV for the first episode doesn’t shy away from emphasizing the main woman’s sexual allure:
Gifs:
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