I like Alana's older girl/younger guy series. Forgot what it's called. What sets it apart is that the older woman is usually seduced by the young guy and at his mercy- quite the opposite of the typical, predictable scenario where the milf is the aggressor just because she's older.
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"What I do know is that if Karen Carpenter and Mama Cass Elliot had shared that sandwich they'd both be alive today." -Michael K