This time, we're going to be looking into the love between siblings...! A Amateur brother and sister are taking on a thrilling, naughty interview! The brother asks his sister about her "first experience" and "erogenous zones," which siblings never talk about with each other, and if she can answer, she wins a prize! As the questions get more and more extreme, the brother gets an erection when he sees his sister's feminine face! His sister's "impressions of vibrators" and "impressions of creampies" make the brother's arousal reach its peak! Can he hold back his arousal until the end and get the prize? Or will he cross the forbidden line? What will happen?