Mom and Step Son Accidental Erection- the Viagra Incident

You're supposed to be getting ready for your Aunt's funeral but you have a splitting headache. Your stepMom walks into the kitchen telling you she's almost ready to go and..."why are you still in your pajamas and... watching cartoons!?" You explain that you have a terrible headache. So your stepMom goes to the cupboard and reaches up on her tiptoes to reach the extra strength Aleve. As she's feeling around while talking, she doesn't notice when she grabs the wrong bottle. "Here son, go ahead and just take 2, and then go get dressed. We are already running late." she says.
Later she comes into your room to find you standing there with new problem....a RAGING BONER!!! "What are you doing??!" She asks. You explain that it just happened and you can't make it go away, not even by jerking off. She suddenly realizes what happened, runs downstairs and sees that she gave you the wrong pill! What's a good stepmom to do? She comes back up and tells you she's going to fix this for you. A handjob leads to a blowjob...but it's still not getting you close. She pulls down her panties, leans over the chair, slaps her backside and tells you to “just do it. Come on baby, it's okay. Let's just get 'er done!" The idea does sound awesome, so you plunge your throbbing cock inside your stepmother. She moans and pushes against you. You are thrusting in and out of your stepmom until she cums. That gets you really close, and you tell her that you are going to cum. She turns around and jerks your cock until you unload all over her face. She's not convinced that your balls are empty so she sucks on your cock to make sure that her efforts have done the trick. "You must not tell anyone what happened...This has to stay a secret." she says "I know mom, thank you." She wipes your cum off her face and tells you to hurry up and get ready, giggling as she leaves the room