During gym class, Ayane tells Sensei that she doesn't feel like running because she's "really horny", and suggests that they have sex in the storage room. He is concerned about the risk, but she persuades him to do it anyway, and suggests various positions they could try (although admits to having made up "backwards spider crawl"). Before they start, they talk about what Sensei wants Ayane to call him during sex. Afterwards, they have to find a mop and bucket — this comes in handy for explaining what they're doing, since it turns out the lock on the storage room door is broken.