Two serious glasses-wearing girls who usually do nothing but study. - But actually, she's a slut. - When the two of them were having sex at home and drinking together, they got fucked and started playing tricks on their sleeping brother-in-law! - At first, it was cute pranks such as licking the face and ears, but the pranks gradually escalated to find out which one can do more amazing things such as nipple licking, tongue chewing, and hand jobs! - Even if my brother-in-law wakes up in the middle of the day, I will continue playing pranks! - In the end, the two of them fuck the confused brother-in-law!