It could have to do with the green-blue haired lady (Bluna).
When she was there and fucked Tonk, first Ryry was together with both in the kitchen, and it looked like Both Bluna and Tonk asking for her confirmation, and later when Tonk and Bluna were in the bedroom, Ryry and another guy were in the livingroom and Ryry was crying.
Yes, that would be my guess too. When first there, Ryry even seemed to help Tonk get the bedroom tidied for what was to follow which they did seem to discuss. Then when it happened, Ryry got v upset. With the other girls, Ryry has participated and they have had a threesome. With the blue haired girl this didn’t happen and perhaps that is the reason - Ryry feels excluded.
I related Ryry’s behaviour to Bluna, because she hid herself in the closet. Ryry even avoided to say good-bye, when Bluna left, but made sure she sees what Tonk does with Bluna in the hallway.
But as Terrell already pointed out, in the end, they seemed to have rearranged.