Scene features something alluding to/implying that 2 or more girls had sex with each other, but the scene doesn’t actually show it.
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Rating: 4
When Kai gets back to Miriam’s home, he sees Rebecca and Gwen making out, with Gwen referring to her as “Sis.” Miriam tells Rebecca to go off and have sex with her so she can talk to Kai some more, so they leave. Kai briefly wonders about what they’re doing to each other after they leave.
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Rating: 1
Miriam talks about how she has had sex with all of her daughters.
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Rating: 2
Kai learns that Gwen has a magic butt plug inside her to keep her temperature down. He then learns that Gwen had sex with Miriam in order to generate the needed energy to analyze Kai’s message.
Miriam is described as a succubus that’s short and flat chested, which confuses Kai, so she’s sounds like a 1000 year old loli trope. But based off the Vol. 6 cover, Miriam does not look like a loli. It’s honestly hard to say what she’s supposed to look like given the description and official image having differences.
When Kai meets back up with Rebecca, she says how Miriam had sex with her as well. There’s no “Cheating” tag for this because Rebecca and her husband have an open relationship due to her being a succubus.
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Rating: 5
Aldea makes out with Gravel and starts to have sex with her.
Highly recommend checking out Ep. 7 of the Anime for this scene, it’s much longer and more explicit there.
And their relationship in the Light Novel, which is translated, goes even further if you want to check that out as well.
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Rating: 3
Estelle gets turned on listening to the MC and can’t control herself. She ends up jumping on Iris and sucking on her breast.
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Rating: 3
During a game, Haruna is felt up by Risa and Mio through a massage.
It implies some sexual stuff happens off screen, but it doesn’t show it.
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Rating: 3
When Miyuki overhears Tomoko’s moans through the door Furukawa’s guarding, she begins to think of having lesbian sex with Tomoko.
It’s strongly implied this is what happened off-screen after the Previous Scene, but it could also be Miyuki’s imagination. This is never answered and left up to interpretation.
(Given how vivid Miyuki’s thoughts are, I choose to believe this is actually what happened and it wasn’t just her imagination.)
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Rating: 2
Miyuki claims to not remember going to the beach, so Tomoko attempts to “remind” her, implying she’s going to continue where they left off from the Previous Scene.
(There’s a lot of strong implications that they do have lesbian sex with each other off-screen, but it’s never confirmed.)
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Rating: 3
A short scene shows the MC coming home to find Yejin and Yoobin having lesbian sex with each other.
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Rating: 5
Yejin has lesbian sex with Yoobin while the MC just watches.
Eventually, the MC joins in as well for a threesome.
There’s a joke at the end of the Ch. 40 with Yoobin putting the on the Strap-On, saying it’s her turn, but nothing comes of it.