Tape her up

You pick up two rolls of ducttape that were lying in the trunk and twirl them in your fingers. "Mom, I´ve changed my mind."
"Oh thank God Jim. I knew you would come to your sense." She seems relieved and gets out of the trunk. As she gets out you grab her hands and pin them behind her back. In her shock, she forgets to resist and so you somewhat easily tape her wrists together and manage to start on her elbows. "Jim what in the hell are you doing!?"

You smirk and finish her elbows, starting on her ankles. "I´m just taking precautions Mom, I have a lot of fantasies that I want fullfilled and you´re gonna fullfill them. Now stand still or I´ll uppload you know what."

She slowly stops resisting, letting you tape her wrists, hands, elbows, ankles, knees and around her beasts, making them stand out more. Next you step away and take of one of your sweaty socks. She wrinkles her nose in disgust when you press it against her mouth. "Open up Mom, you know what happens if you disobey."

After a few seconds, your mom slowly open her mouth a little. You take the chance to ram in your socks, filling up her mouth. Next, you pick up the ducttape roll and tear of a few big strips. Your mom closes her eyes and resigns herself to your treatment as you press the first strip firmly over her lips. Next one goes a bit under her nose, and other further down her chin. Just to be sure you also take a strip and ask her to raise her eyebrows. She obeys and you place it semi-snuggly over her eyes.

You help her over to the car and gently tip her into the trunk. Once inside it, you fold her into a fetal position and roll some tape around her to keep her that way. As you close the trunk you hear her starting to wail into the gag.