Oh. Well after finishing her training as my sub, I haven't been able to activate punishments since. Hopefully that is a feature to be added later, like the current content of being able to go back to earlier "first time" sex scenes for some people.
Did you set her up as a trophy slut or merchant? If she's a trophy slut, she'll have more time to prank you. If she's a merchant, her pranks are rarer. Anyway, Sera is not 100% obedient so, she'll still act out at times.
Watch out for the shower.