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: 4
The chapter starts with Nakai’s POV and we learn that she has a crush on Hikaru.
We then see Haruto convincing Hikaru to get Nakai to join them for a threesome.
Hikaru seduces Nakai by making out with her.
It then cuts to 2 weeks later with Hikaru and Nakai nude together, implying they had lesbian sex multiple times off-screen during the time skip.
The rest of the scene is a threesome with Haruto joining them.
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Rating: 4
Misaki catches Rin spying on her having sex with the MC, so Misaki goes to make out with her and seduce her.
Misaki then fingers and teases her as well before having her join them for a threesome.
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Rating: 4
1 of the FMC’s is groped by another girl before the MC comes over and has sex with them.
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Raw Chapter Link
Rating: 4
A guy records 2 girls having lesbian sex with each other, but eventually they invite him to join for a threesome.