2T4U/Have them remove their clothes
From Create Your Own Story
You say, "I am making sure neither of you need a shot, but we all have to be naked for me to help."
They are clearly scared and take off their clothes quickly. Had it not been for his 4" hard on, they would have looked identical. Missy looks at your dick, but doesn't say anything.
You tell them how to position themselves, and offer a guiding hand in the process. You use plenty of lube and stare at the 2 assholes you are about to take. You look from one asshole to the other while making the decision on which ass to take first. You finally decide on Aaron to start, then Missy. That way, at least you are coming in a girl, rather than a boy.
You position yourself so with a little force, your dick enters his tight asshole. You expect him to howl in pain, instead, he gives a moan of pleasure. You slowly force your dick all the way in, and he starts to moan louder. You start to fuck his ass with a ferocity you didn't know you had, which left him moaning all the more. You slowly pull out and see his asshole stay open for a little before closing tight again.
You lube up again and enter your sister's asshole the same way. She moans from the pleasure as well. This time, instead of taking it easy, you slam your dick all the way in, which causes her to moan loudly. After several hard thrusts, you are finally able to find release. Your cum doesn't want to stop flowing, so when you believe your sister's ass can't take any more, you pull out and take your brother's again.
Once you are done, you pull out of his asshole and stare at both. Both are dripping your cum, which causes your dick to twitch.
What do you do now?