The odds were that Sion would have to suggest it as Akiha wasn't thinking much about something like that, even if she was enjoying her girlfriend's attempt to get free. She knew it wasn't a real attempt or she wouldn't have maintained her grip.
As Akiha switched to the other nipple, this one being sucked upon, Akiha leaned more of her weight forward onto her hands, pressing Sion's wrists even more into the bed. Using her leverage, she shifted her legs back, pushing herself up onto her toes to change the angle of her hips. It made the force of her thrusts stronger, though she couldn't give her girlfriend's chest any more attention and still keep rhythm.
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As Akiha switched to the other nipple, this one being sucked upon, Akiha leaned more of her weight forward onto her hands, pressing Sion's wrists even more into the bed. Using her leverage, she shifted her legs back, pushing herself up onto her toes to change the angle of her hips. It made the force of her thrusts stronger, though she couldn't give her girlfriend's chest any more attention and still keep rhythm.