Scene is from a hentai.
Series Page
Raw Chapter Link (Pages 216-232)
Rating: 2
The girls very briefly press their breasts together while asking for the MC to take their measurements.
On Pg. 232, Ayaka begins to demonstrate seduction techniques on Sakaki, but they get very quickly interrupted before anything can happen.
Series Page
Raw Chapter Link (Pages 130-158)
Rating: 1
The MC has a threesome with Kami and Ayaka.
Series Page
Raw Chapter Link (Pages 652-655)
Rating: 3
The MC briefly imagines having a foursome with Erika, Kaname and a non-gyaru version of Shion.
Series Page
Chapter Link (Pages 7-11)
Rating: 3
Chapter 2’s story is a short story about Misaki and Wakana’s love/sex life.
Series Page
Raw Chapter Link
Rating: 4
Karen seduces and has lesbian sex with Ayano while giving her a massage.
(I’m unsure of what chapter number this will be when the Translation reaches this scene.)
Series Page
Raw Chapter Link (Pages 42-45)
Rating: 2
The MC has a threesome with Madoka and Yui.
Series Page
Raw Chapter Link (Pages 25-28)
Rating: 3
Yui and Madoka have lesbian sex with each other while the MC’s forced to watch.
Presumably they go to join him afterwards off-screen.
Series Page
Chapter Link
Rating: 2
The MC has a threesome with Mana and Shion.
Series Page
Raw Chapter Link (Pages 193-195)
Rating: 4
Rin and Kaori are briefly shown having lesbian sex with each other at the start of the chapter.
The narration lets us know this was their first time both with each other, having lesbian sex in general and how much they both enjoyed it.
(Since this is about couple swapping, I’m not giving this the Cheating or Netorare tag.)
Series Page
Raw Chapter Link (Pages 229-232)
Rating: 2
Rin and Kaori briefly kiss each other while they have a foursome with their husbands.