Series Page
Chapter Link (Pages 48)
Rating: 4
Ruka and Naru basically have a lesbian threesome with Tsuruko when trying to teach her about anal sex.
Shiritagari Joshi – Chapter 3
Tag: Masturbation
The scene features a girl masturbating while either thinking about a girl or in front of another girl.
Amoral Island – Chapter 2
Series Page
Chapter Link (Pages 1-22)
Rating: 5
After finding out that the MC had sex with Ui and Uka, they both then invite Mikuru to try it out as well and have lesbian sex together.
Ui and Uka admit to having tried out having sex with each other before.
Saki hesitates to agree, but Mikuru says that she’s interested and says she’ll do it.
Ui, Uka and Mikuru proceed to have a lesbian threesome with each other while Saki watches and masturbates to them, seemingly eager to join as well.
I’m unsure if this will continue into chapter 3, but given Saki’s reaction, it seems likely that it will and that she’ll join.