Work the glory hole in the bathroom.

You know from stories that there is a hole in the wall that connects the men's and women's bathrooms. You think it would be hot to have your mom blow complete strangers in a bathroom.
"Mom, I want you to go into the women's bathroom and sit in the stall with the glory hole. You will then blow any dick that comes through the hole. Got it?" you tell your mother. Kathy, looks pissed, but at least it's only oral.