Hot Step-Mom jerks off her step-daughter's boyfriend to prevent them from having sex!

I know my daughter and her new boyfriend she met in college this semester fool around. She knows I approve of her sexual expression so long as it is done someplace other than my home. I am proud to know she practices safe sex, always with a condom. As open as we are about sex in our family I just don't want to hear my daughter moaning and groaning in my house. You can imagine my surprise when I'm putting her laundry away and find her naked boyfriend in her bed. She passed me in the hall in quite the hurry saying she was on her way to the store. Now that I see this young naked guy I understand what was about to happen under my own roof! Hmmm, so how can I prevent this hormone driven coupling from happening? If my calculations are correct, it will take Ashli about 7 minutes each way to the store and back. This gives me just enough time to grab ahold of this wanna be pussy stuffing dick and crank out his cum before she returns with the condoms.