Scene is from a hentai.
Series Page
Raw Chapter Link (Pages 50-71)
Rating: 2
Kaori has a foursome with Ami and two other guys.
(This chapter is translated, but due to it being official, finding a free link is a hassle.)
Series Page
Raw Chapter Link (Pages 15-17)
Rating: 1
Nozomi tells Kaori that she’s had sex with a teacher in the past, but the teacher’s face isn’t shown, nor is the actual sex.
Extra Art 4 shows the teacher’s face while having lesbian sex with Nozomi, so she may show up for real in a future chapter.
(This chapter is translated, but due to it being official, finding a free link is a hassle.)
Series Page
Chapter Link (Pages 155-157)
Rating: 3
Kanda briefly makes out with Kaori in front of a group of guys.
Afterwards, they have an orgy with all of the guys, but nothing yuri happens during it.
Series Page
Chapter Link (Pages 150-154)
Rating: 1
Kaori is briefly shown having another threesome with Ami and Ryou.
Series Page
Chapter Link (Pages 140-143)
Rating: 2
Kaori is briefly shown having another threesome with Ami and Ryou.
Series Page
Chapter Link (Pages 120-132)
H-Anime Version: Episode 2 Scene 2
Rating: 1
Kaori has another threesome with Ami and Ryou.
Series Page
Chapter Link (Pages 114-115)
H-Anime Version: Episode 2 Scene 1
Rating: 3
Ami very briefly grinds her thigh against Kaori at school.
Series Page
Chapter Link (Pages 53-59)
H-Anime Version: Episode 1 Scene 2
Rating: 2
Kaori has another threesome with Ami and Ryou.
Series Page
Chapter Link (Pages 11-35)
H-Anime Version: Episode 1 Scene 1
Rating: 3
Kaori is seduced and raped into a threesome by Ami and her sex friend, Ryou.
Series Page
Rating: 3
Extra art of Madoka getting caught being kissed by another woman.
This art was posted on the artist’s twitter last year and they have not released a larger/zoomed out image. (If there even is one.)
This may possibly be a cameo/preview of the upcoming 6th chapter of Midareuchi, but that’s just my speculation. Otherwise, this is most likely the author wanting to draw some random yuri with Madoka.