Make her swear

If there is one thing he knows about his straight-laced church-going mother hates, it's foul language. Even mild profanity will earn a disapproving glare. Stronger swearing will likely result in a lecture on polite behavior especially if there are women or girls present. So if he can get her to curse he will know for sure the device is working.

Trying hard to stay casual he concentrates on her again, projecting his entire lexicon of bad words at her while she chatters happily about the neighbors.

"...anyway Mrs. Kelly came round to borrow a cup of sugar but I think she was more interested in checking out the gardener I hired to clear the yard," Claire gossips seemingly unaffected "Honestly, she's such a fucking whore. I could practically smell her cunt soaking through her panties when Antoni took his shirt off."

"Mom!" Jason gasps taken aback by her sudden crude turn of phrase.

"What?" she asks confused by her son's interruption "Do I have some shit on my face? Fucking flour it gets everywhere, I swear, it's worse than fucking cum..."

She hurries off to the bathroom to check her makeup leaving a stunned Jason sat at the kitchen table. There can be no doubt about it now, the device is real. Even on its lowest setting, it had affected his mother dramatically and seemingly without her even noticing.

The idea of having that kind of power is thrilling, the things he could do, the things he could make others do. He feels his cock stir as his imagination runs riot. A small voice at the back his mind protests that the things he is picturing are immoral and wrong but he ignores it, already planning what he wants to try next.