If the scene starts as fully yuri, but eventually a male comes in and joins them. (The “Male Involved” tag is only used if the male is involved from the beginning of the scene.)
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Rating: 3
While the MC is a threesome, a group of girls are having a lesbian orgy in the background while watching them.
At the end of the chapter, the MC briefly has sex with those girls.
The tags are for the lesbian scene going on in the background, but the focus of the chapter is the threesome.
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Chapter Link
Rating: 4
The chapter starts with Rie and Yuko having lesbian sex with each other again, but Yuko decided to surprise Rie by inviting a guy over.
The rest of the chapter is a threesome.
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Rating: 3
Susan gropes and fingers Sara in the bath, but eventually the MC joins them and it becomes a threesome.
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Rating: 2
All of the girls end up accidentally groping and rubbing against each other while playing a game together.
Eventually the MC joins in as well.
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Raw Chapter Links: Ch. 19 – Ch. 20
Rating: 2
Ayumi and Kaho end up rubbing against each other while taking a bath together.
Eventually the MC joins them as well.
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Raw Chapter Links: Ch. 17 – Ch. 18
Rating: 2
Matsuri gets a full body massage from a female masseuse.
The scene continues for only 1 page in Ch. 18, the rest of it is the MC having sex with Matsuri.
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Rating: 3
Sayaka briefly gropes Ayumi’s breasts in front of the MC.
Later while they’re washing the MC, they all slip on top of each other and “accidentally” have a threesome together.
(Fucking Hentai Logic lol.)
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Rating: 3
Sayaka and Matsuri end up groping and rubbing against each other while play-fighting in the mud.
The MC joins in at the end of Ch. 5.
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Rating: 1
Matsuri briefly gropes Sayaka’s breasts while they’re taking a bath together.
The rest of the chapter is a threesome, so I have this tagged as Male Joins.
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Rating: 4
Chitose notices that Ayano is turned on and disappointed that she didn’t get to have sex with the MC before he left, so she starts to have sex with her in order to help “relieve” her.
Eventually the MC comes back and joins them for a threesome.