OBA-101 - My Aunt is My Tutor: Uncontrollable Desires from 5 Years Ago

Aunt Sayuri comes over to tutor my sister, but I can't forget the days she tutored me 5 years ago. I've been obsessed with her intellectual charm ever since. Today, she catches me staring with lust, and instead of getting mad, she makes an unexpected move that pushes me over the edge.