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Rating: 4
The MC has Aria have lesbian sex with Maya as punishment.
Eventually the MC joins in for a threesome.
Strategic Lovers – Chapter 46
Tag: Full Nude
Scene features at least 1 girl fully nude.
Tsuya Ane ~Onee-san no Micchaku Jugyou~ – Chapter 4
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Rating: 4
Kaori goes to seduce Miki and briefly has lesbian sex with her.
Eventually the MC walks in and joins for a threesome.
Show Ten Kanojo – Chapter 7
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Rating: 4
Mayu has another threesome with Midori and Mistunobu.
Golden Scale – Chapters 21-23
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Rating: 4
Yueling and Ruyun have lesbian sex with each other while the MC hides underneath their bed.
The MC then secretly joins in multiple times without Ruyun knowing until the end.
Kaede & Suzu – Chapter 6
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Rating: 5
Suzu ties up the MC and makes him watch as she has sex with Kaede without him.
Eventually they untie him and he joins in for a threesome.
Kaede & Suzu – Chapter 3
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Rating: 4
The MC and Suzu tie Kaede to a chair and take turns having sex with her before having a threesome together.
Renai Fuyou Gakuha – Chapter 4
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Rating: 3
Takano has a threesome with Shiro and Chiyomaru.
Chishojo Fuuki Iin no Minna ni Ienai Inbi na Onegai – Chapter 6
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Rating: 5
After Saki’s mom finishes having sex with the MC, she has sex with Saki as punishment for hiding her relationship from her. Saki gets very turned on from having sex with her own mother.
Eventually the MC rejoins them and it remains a threesome for the rest of the chapter.
Saki’s mother is married, but there’s no “Cheating” tag because she got permission from her husband to have sex with them.
Kanojo to Ane no Nijuurasen – Chapter 1
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Rating: 3
At the start of the chapter, Kaede punishes Shiori for having sex with the MC, which ends up Shiori tied-up and a dildo sticking out of her.
Later, while the MC is having sex with Kaede, Shiori decides to join in and puts on a strap-on.
Sex Study Group – Chapters 65-68
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Rating: 3
The MC has a threesome with Hyun-Mi and Su-Hyun.