The eyes roll back in the head. That is how you know the drug has gone to the spine. Takes the better part of a second.

Ronette taps her on the butt.
"We are on the clock now, cowgirl."
"Aw, but he's still hard."
"Duty calls."

Annabelle dismounts and does the business with the BP cuff and heart monitor. The numbers could be better. They will have to countersuggest red meat, maybe get him to take some constitutionals.