Can anyone identify this Hustler scene?

[lezziewillow]

Just came across a random preview clip on my harddrive. Looks like it's in a school changing room with a janitor getting blown by a schoolgirl, but that's all I can tell. The way the clip plays out you don't ever get to see more than the back of the girl's head. I'm not having any luck using any search engine.

Here's a screenshot - click for a larger view:
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Can anyone help? The file name is scene4_clip1.wmv, if that helps.

Thanks.