So she waits until the kids are asleep before she starts masturbating. Okay, good way to manage your time, but for whatever reason, this happens so infrequently that she gives herself a 2nd go out of desperation since she doesn't know when she'll get the chance to do it again. (Why can't she make this a nightly routine, exactly?) Come on, kids. You don't want to help your poor mother out by letting her know of your OWN activities, and that her own are nothing to hide?
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There are so many reasons a mother of 2 kids probably can't masturbate everynight. Probably has a job most mornings, so she masturbates on the nights before her days off. And based on the final panel it is in fact habitual already. Don't overanalyze a short porn comic.
Based on the final panel, all of this tip-toing around just looks unnecessary. And the kids say this is her 2nd time passing out this week? If she can't make this a nightly thing for whatever reason, that sucks, but she clearly doesn't have THAT busy of a schedule for her to worry about MONTHS passing before she can do it again.