Or, could be morning sex at 6AM. Max wakes up early to see them in action. Then he joins Kira & Ann in the shower...it started with kira sneaking in, and now they've been at it all night and into the afternoon. I'll add a red hue and some sunbeams coming from the window to simulate scissoring sisters at sunset, to complete the 24hour marathon set.
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Leading to Max fucking Kira in front of Ann, and Ann wishing it was her being fucked by max.