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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: Seduction
The scene features a girl trying to seduce/coerce another girl into having sex or doing something erotic together.
Jokeunomi – Chapters 15-16
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Rating: 4
2 of the FMCs briefly have lesbian sex in front of the MC.
But then the MC joins, turning it into a threesome.
Suketto Sanjou! – Chapter 13
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Rating: 4
Sandy and Wendy begin to have lesbian sex with each other in front of the full team.
Eventually they get the MC to join in and the scene turns into a threesome.
RE: Twenty Three – Chapter 25
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Rating: 4
After the MC finishes having sex with Maya and she tilts her head back, the MC quickly escapes and swaps out with Amber.
Amber then ties Maya up and has lesbian sex with her.
The MC rejoins in the next chapter, so I have this tagged as Male Joins.
Soshite Kyou mo Moteasobareru – Chapter 3
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Rating: 5
After Nagi has cheating sex in front of her boyfriend, she starts to breakdown and cry from the guilt.
This prompts Kohana to try and comfort her by briefly having lesbian sex with her.
Afterwards, 1 of the NTR guys join back in for a threesome.
Koi no Gunfight – Chapter 3
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Rating: 5
While the MC and Rin are in the middle of having sex, Luka shows up and kicks the MC out so she can have her turn.
Luka and Rin then have lesbian sex with each other while the MC watches.
After they finish, Rin goes back to having sex with the MC.
At the end of the chapter, Rin asks to do this type of thing again with Luka.
Koi no Gunfight – Chapter 2
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Rating: 5
This chapter introduces Luka, who after being saved by Rin in the game they play together, falls in love with her.
Luka then invites Rin and the MC over to her place, where she spikes both of their drinks to make them pass out.
Luka then rapes and has lesbian sex with Rin in front of the MC while he’s tied-up, stating that he doesn’t deserve her and she’s going to steal her away.
Eventually Luka also has sex with the MC, but then she goes back to Rin.
Women’s Orgasm Massage – Chapters 23-24
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Rating: 5
2 of the FMC’s have lesbian sex with each other in front of the MC before he eventually joins them for a threesome.
Compla Yuruyuru Chimari-san – Chapter 6
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Rating: 3
The FMC briefly has lesbian sex with another girl before they’re joined by 2 other men for an orgy.
Nothing yuri happens once the men show up.
Hero Girl x Healer Boy: Touch or Death – Chapters 46-48
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Rating: 4
Influenced by Akashi, Sekai and Ushio briefly have a lesbian threesome with Domeki.
But the MC quickly joins in as well and the rest of the scene remains an orgy with him involved.
There’s a few colored pages of the orgy part of this scene back in Chapter 41.