The chapter starts with Toshima waking up nude while cuddling with Melissa, implying they had lesbian sex.
She then freaks out and goes to tell the MC the whole story.
It starts with them getting drunk at a bar, which cause Toshima to realize she loves “cute girls” and she kisses her. It then proceeds to them going to a hotel and hooking up.
Continued from the last scene, Eri and Takamine go to a karaoke place together.
Takamine then proceeds to undress and have Eri grope and 69 her.
To explain why Takamine is doing all of these things to Eri: Takamine is unsure about how the MC feels about her and how a lot of her advances have gone nowhere. She then does everything she’s done to the MC on Eri, so she can get the full picture. So this is supposed to be a demonstration, not Takamine trying to seduce or have sex with Eri.
The entire time however, in Eri’s thoughts, she keeps wanting to go further and do erotic things like lick her breasts and have sex with her.
Eri then screams about how hard it was for her to resist temptations and that there’s no way the MC didn’t feel the same way.
At the end of the chapter, Eri’s girlfriend found out about the whole thing and proceeds to punish her.