Shishunki no Obenkyou EP2 - Around the Age of Choosing Experience over Studies

One rainy day, Kasuga finds a non-fiction sex education book in the school library. She gets horny and wants to do the same thing to Kobayashi as last time. While looking through the book, she finds out that she had sex with Kobayashi and learns that this can lead to babies. Kobayashi storms into the library, asks her if she has an umbrella and if they can go home together. On the way home she tells him about what they were up to recently and how babies are being made. She asks him if they can have sex again. Kobayashi, shocked, agrees after some persuasion.