1. Ikenai Koto (We Can't Do That) 
2-3. Ienai Koto (Unspeakable Things) 
4. Ikenai Koto: Ayaka (Naughty Things: Ayaka) 
5. Ikenai Koto: Radio Drama Version 
6. Ikenai Koto: Misato

She's been photographed doing something she shouldn't have... Now she's blackmailed into being a plaything for men.

(Source: AniDB)

A female teacher finds her sister fucking two dudes at her place. She decides to get in on the action... to protect her sister of course. 
 
Episode 2 involves a slutty teacher who gets caught doing some naughty stuff and now she has to do some more naughty stuff.

Misuzu invites his boyfriend Yuto to stop by eating somewhere and tempting to let his boyfriend do perverted things on the train later on the journey on condition that they can only do nasty things from outside the clothes alone, and should not touch directly with the body. When there is a shock on the train journey, Yuto and Misuzu are separated. And foreign men on the train take advantage of this opportunity to sexually harassing on Misuzu. 
 
(Source: Nekopoi and Has Been Translated and Edited)

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