Cosplaying stepsister fucks you before her party

Your stepsister Ellie comes in dressed in a Toga cosplay, ready to go to a costume party. She knows you've been stealing her panties and wants you to admit it. There's no point hiding it, especially since she doesn't seem upset. She goes on to say how it isn't THAT weird since you're only STEP-siblings and not actually related by DNA. Rumor has it that you've got a big cock and it turns out she wants to see it! She unzips your pants and finds out that you really are a big boy down there and starts to suck it. Ellie wants that hung cock inside of her and gets her wish, hopping on and going for a ride. You both climax and she leaves you with a little gift to remember your first time together...