Is Oki also a pervert getting off on blocking Katagiri from getting off from blocking Okada (whew a mouthfull)? Is it perverts all the way down or are we looking at a yandere situation? We'll see!
The fake out at the beginning got me: while yes it's not like Okada actually talked normally with her without looking at her boobs, but it seems Ooki does want to screw with Katagiri. I love how the litle sister's misunderstanding(?) keeps on going and everything still fits.