日語 Japanese Ask Questions Thread2 質問

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Japanese - Ask questions thread
http://dis.4chan.org/read/lang/1174719097/l50

Hello

I wonder if someone could help me? There is a brilliant piece of Japanese porn on this link here:

http://www.mammothtube.com/cgi-bin/atx/out.cgi?s=75&c=1&l=no&u=/movies/48/483768/beautiful-asian-teacher-got-gangbang-by-her-students/

I would love to know why the teacher lets the students lift up her skirt, and then allows them to go further. Does she say anything to encourage them? Could someone who speaks Japanese please tell me what is happening here? Many thanks.