Ana no Oku no Ii Tokoro Episode 1

Synopsis:  A tsundere high school couple have some fairly vanilla sex, followed by the very un-vanilla saga of Kyouko’s infidelity to her husband, and her step-son Takuya’s quest to bring the whore to justice.
Alternate Names: 穴の奥のいい秘部 [ところ]
Aired: Dec 12, 2014 to Feb 13, 2015
Producers: Queen Bee 
Source: Manga