Fauna got to be the doting onee-san who took the lead in teaching Kronii all the true pleasures of being a woman while Mumei watched from the window outside even though Fauna told her it was raining

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"Fauna, I think we should stop..."
"Why? You're already so wet!"
"Mumei's even wetter though!"
Fauna grabs Kronii's face. She kisses her, forcing her tongue inside
"Focus on me"
Fauna gropes Kronii's breasts from under her sweater
She pinches and rubs her nipples, using her reactions to gauge how hard she should do it
She slowly runs her hand down her body, reaching inside her pants
Kronii can't resist her, that ASMR session they had before made her too weak
She moans, burying herself in Fauna's chest
"There you go... just enjoy it"
Fauna keeps whispering sweet nothings to her as she fingers her
Kronii has to move herself away, trying to hold it in
Fauna switches around caressing her body or simply focusing on a few parts
As Fauna gets more serious, Mumei's breathing gets faster, her breath condensing on the window
She starts masturbating, trying to follow Fauna's rhythm
Her fingers slip right in without any resistance
She starts licking the window, watching Kronii's expressions change, getting closer and closer to an orgasm
"F-Fauna, I'm..."
"It's okay, Kronii" Fauna nibbles on her ear, "Do it."
Kronii holds Fauna hard, her walls contracting wrapping around her fingers
"MMM- AHHH"
Mumei leans on the window, shivering from the cold and the pleasure
Fauna makes a satisfied face watching the both of them
She leaves Kronii in the bed, enjoying the afterglow while she brings Mumei inside
She dries her up and makes her lie down in bed
She gets in the middle, holding them close
She starts caressing them again
"Wanna keep going?"