From description:
Velvet Love was a mature mare, a milf as her students would jokingly call her. On a field trip, she and her students explore a cave, where her favorite student decides to lure her into an area away from the students. However, this proves to be a terrible idea, when a spider grabs her, strips her of her clothes revealing her black panties. Once she is fully webbed up, she notices her friend hasn't been webbed, and calls for help... but instead of helping, he unzips his pants.

not my best work, but I had this in my mind for a day, decided to draw it.