The third period is health and physical education.
Today we're learning about the differences between male and female bodies.
Now, pair up with the guy next to you and observe each other's bodies carefully.

"Okay, now I'm going to have Hamada ejaculate on our behalf, so everyone watch carefully. -- Are you ready, Hamada?"
"Y-Yes, I'm ready."
"Okay. Then Hayakawa, you partner up with me, help out."
"What should I do?"
"Spread your legs and give Hamada a good look at your genitals. That's all. Ah, so everyone can see them clearly."
"Okay. Is this okay?"
"Okay, that's good. How's it going, Hamada? Do you think I can do it?"
"Y-I'm fine. Thanks to Hayakawa, I think I'm about to come."