Lisa had never seen the dog around the school before, although by its heavy leather collar it obviously was somebody's pet and not merely a stray running wild. It looked well fed and cared for, its fur glossy and combed. It also had an intelligent if slightly wicked gleam to its eye, and it was a handsome beast in a savage and untamed manner that inadvertently brought chills to Lisa while she stared speechless at them both.

The monstrous brute remained on its haunches as if it hadn't noticed Lisa's entrance and was entirely absorbed by the obscene vision of Marge Spanner's indecently displayed genitals. And, still more horrifying to the wide-eyed teacher, was what the fifteen year old girl was doing to her pussy! The budding teenager's hands were crawling over the thinly hair-covered cunt lips, her erotically probing fingers working deep up inside the tiny hole of her vagina with the unmistakable cadence of masturbation!

This was the soft sucking sound Lisa had heard all the way out in the hall… and the moaning purrs of pleasure coming from the girl's parted lips were the whimpers and mewls which had forced her to investigate! Frozen to the spot, Lisa gasped in stunned disbelief at the perverted spectacle of this immature child finger-fucking herself in wanton disregard of common decency, right in front of a dog! But perversely, as the older woman watched she couldn't help remembering the many nights alone when she'd nearly gone insane with sexual desire… until she had relieved herself the same way with her own fingers, masturbation being the one and only way she'd ever been able to openly respond to the passions locked inside of her. The teacher blushed scarlet as the guilty thought flicked through her consciousness, her breath involuntarily quickening.