Aki didn't get off of Andrew right away, in fact, she didn't even pull out her husband's cock since, Andrew is no ordinary human and despite having cum, his cock was still erect inside her.
She wanted to keep riding Andrew, she just was enjoying the feeling of being filled by her husband's cum. However, Andrew wasn't going to let Aki take advantage of her position.
Patting Zany's ass, he made it clear that he wanted her to move and she did. Now that Zany's ass wasn't blocking his view, he looked at Aki who seemed to want to start moving again, and reproached her, "Don't be abusive, it's Zany's turn."
Aki pouted cutely as if she didn't want to obey, so Andrew stood up and with both hands gave Aki a hard spank that made her scream, and the sound it generated even drowned out her scream.