Onii-chan, Let's Do it More!

''' "Onii-chan, Let's Do it More!" ( Oni-chan, Motto Shiyō yo!  お兄ちゃん、もっとしようよっ )    ''' is the second episode of the Imouto Paradise! OVA. It was released on April 20, 2012, by MediaBank, under their GOLD BEAR label, and directed by Murakami Teruaki.

Full Summary
Sōichirō has yet another erotic dream, with Hiyori and Koharu in it this time. He is once again woken by Aya, however, this time, she has noticed that he has had an erection and wants to please him, by having sex. But before long, Sōichirō has had enough and thanks her. Aya pretends to her sisters that nothing has happened, but she has realized that since they had sexual intercourse for the first time, Sōichirō started to change a little bit, and notes that even if she asks for it, he is never in the mood. She feels like she is being avoided, and doesn't know what to do. Michika notices Aya's strange behavior. After asking to see it, Sōichirō shows Rio what a porn site looks like. She confides to him that she doesn't know much about sex, and wants to know more about it. This leads to Sōichirō and Rio having sexual intercourse.

Sōichirō wakes up to find Michika who has tied him to the bed, and she tells him that what he desires is also her desire. They have sex, but Sōichirō avoids coming inside of her, and says that it was really close, to her confusion. He tells her why, and she answers back, "What a shame." Presumably the next day, Sōichirō asks Aya where the others are, and she tells him that Michika is at the library, Koharu is at her club, and that Hiyori and Rio said that they were going to a friend's house. Aya and Sōichirō are alone together. When asked if she was going anywhere, Aya tells him that they are rarely alone together these days, which he agrees to. She tells him that she has a favor to ask of him, which is to take a video of her masturbating. It is shown that it is embarrassing for her, but she wants to turn Sōichirō on. One thing leads to another, and they have sex. Afterwards, it is revealed that the sisters left the house so that they could be alone. They all come up with the conclusion that he won't come inside any of them because he is concerned about Aya. Rio tells them that they suit each other, so they should cheer for them both. In the end, all of the sisters end up fighting over him.

