Video I'm looking for a specific video clip/scene/movie

[ClassicsWhereItsAt]

Hey all, so I'm looking for a porn clip, where this girl is walking in the woods or on a farm or something, and she sits down and starts talking to another chick, which I think is her sister. Well the sister blackmails her into eating her out, she says, "I want you to do to me what you did to ______, or I'll tell on you". So the chick reluctantly hikes her sisters skirt up and starts to go to town. It's a little older of a clip... Certainly not from the 2000's. Can anyone tell me what the hell this is?? I can't fucking find this shit anywhere!!! Thanks all....