My Two Fuck Girlfriends (Aqours + Futanari)

The story goes by the incident last night when You is asleep alone in her house, she was an ordinary girl before.
and all of a sudden, a meteor shots into You's house and she was knocked out for a while. She then realize she has her own male organ aside from female organ.
Until the two girls which is Riko and Chika knew about You's two organ, they started feeling themselve free and good.

Who is You Watanabe's True Girl Friend?