Sealed with a Kiss by Alexa Riley

When Parker orders a battery-operated boyfriend, she doesn’t mean to send it to her brand new boss. Having him open it is scary enough, but having him deliver it to her? Catastrophic. That is, until he makes her a deal she can’t refuse.
Samuel might have gotten her order by accident, but he’s not willing to give it up just yet. In fact, she can’t have it until she’s ready to show him how she uses it.

Warning: His package is what she wants, and her box is the only thing that will satisfy his needs. If we can’t make puns about mail delivery, what’s even the point of life?!