【961works】Ecology Research Topic is My Mom? Summer learning with friends and teachers

A group of boys gathered for summer vacation.
They go to Yota’s house, where he lost in a rock-paper-scissors competition, to carry out a free research project that he had decided on before.

The subject of the research is Yota’s mother.

The mother is being set up by her classmates right in front of her eyes, and Yota is the one filming the research for the record.
In the end, Yota also started to fuck his own mother, and he used her anal…

And then a mastermind appears who seduces them and targets the mother.