Where can I find this video?

This is from Schulmädchen-Report 8. Teil - Was Eltern nie erfahren dürfen/Schoolgirl Report, Volume 8: What Parents Must Never Know (1974)
This scene is from 45:35 in this copy of the movie:
http://video.fc2.com/en/a/content/20141029Nkk0hdu9/

http://www.dvdempire.com/1610270/schoolgirl-report-volume-8-what-parents-mu
st-never-know-movie.html

The Brunette is Marisa Feldy
The Blonde is Marianne Dupont

For similar films, this is the 8th film in the Schulmädchen series. there are 13 in total released from 1970-1980
https://www.grindhousedatabase.com/index.php/The_Schoolgirl_Report_series_r
etrospective

This is from Schulmädchen-Report 8. Teil - Was Eltern nie erfahren dürfen/Schoolgirl Report, Volume 8: What Parents Must Never Know (1974)
This scene is from 45:35 in this copy of the movie:
http://video.fc2.com/en/a/content/20141029Nkk0hdu9/

http://www.dvdempire.com/1610270/schoolgirl-report-volume-8-what-parents-mu
st-never-know-movie.html

The Brunette is Marisa Feldy
The Blonde is Marianne Dupont

For similar films, this is the 8th film in the Schulmädchen series. there are 13 in total released from 1970-1980
https://www.grindhousedatabase.com/index.php/The_Schoolgirl_Report_series_r
etrospective

It's Fräuleins in Uniforms if you're wondering.