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tbh opal somno where she's actually feeling a little guilty at first and trying not to wake him up sounds cute... rubbing her cock on him because she's so desperate and grinding on his ass, until she can't take it anymore and ends up inside him, bouncing her entire weight on him and not caring if he wakes up
Ofc Bismuth would pretend to be asleep as to avoid confrontation.
Then moan anyways and reveal himself