my mom's... can you do it with his mother after class? can't you do it? shall we bet?

Our friends, who were jealous of our boring school life, made an interesting bet! is that a yarrel for the mothers of my classmates? Can't you do it? And to run is Sano, a handsome preboy of the school year NO1! Sano has a bonus of 10,000 yen for each yaru with one mother! Are you sure your classmates' mothers won't talk to Sano?