Bully

Sick of getting bullied, the girls figured it payback time. Slipping the potion into Daisuke's lunch was the first step of the plan. After he ingested the potion it'll take about one hour for his body to change. During his panic the girls managed to lure him o the back of the school. 

Now in a female form, Daisuke was much smaller and weaker than his athletic build before. The two girls has o problem undressing him, and tying his naked body to a tree in order to humiliate him. The hormones of his new body has gotten into him, that he felt helpless and can only let out a cry. The girls may gone too far on this payback, but they want to make sure that Daisuke will never bully them ever again.