What Alice saw was her older sister take Elena and, in one smooth, fluid motion, put her in a position her older sister used to call 69. But if that was all it was she wouldn't be surprised.
What surprised her was that her older sister somehow fluidly managed to get her crotch and Elena's crotch intertwined, with their vaginas making contact.
"mmmnn~❤️"
"aaah~❤️"
Intuitively Alice moved a little and felt Elena; she felt how their vaginas were so close that a small movement could make them rub together she felt their heat and everything else grasping them both let out little moans and a shiver ran down their backs.
Seraphina, who at that moment was looking at the two vaginas that were close enough to make contact, at some point Elena's panties had also disappeared, not as if they were hiding anything, but she felt there was more freedom and she could see a bit of Elena's normally beautiful black and Alice's golden bush.