Studying!

Ban was confused. What does this have anything to do with Eva's bad mood? 

He continued reading about the Basic of Sex book. From what he understood, based on the book, sex should only given to the one you loved, there's nothing new to this as he already heard about this from the Adventurers.

The book's contents also included how to do it, and what one should do if it was their first time doing sex. 

Ban kept on reading and reading and what he did not understand was that while he was reading, the thing underneath his shorts started to get hard. Of course, he was not new to this as every morning, he would always get this kind reaction. 

While he was reading, especially on the parts where the book provided some basic sex position's illustration, he could not help but feel hot all over his body. His thing kept on getting harder and as it was getting comfortable with Eva on his lap, he finally decided to grab her and move her towards another location.