Special gifts from twin daughters

Sweet twins just turned 18 and for their birthday they want to give a special gift to their special step-dad. They have wanted to for a long time and now, the moment they are old enough, they lead step-daddy into their room. It's their step-daddy's birthday and Joey and Sami know what he really wants, even if he won't ask for it. They want to not only show him how much they have been waning it again, but they want him to know, he can have them ANY time he wants.