Go to work (the girls change outfits, and take you someplace new.)

After a lovely relaxing morning with the two sexy sisters, you excuse yourself to make a few phone calls and check your email. Everything at the office seems to be under control. When you go back out to the living room, you find Jenna and Jessie in tight-fitting work-out pants, tank tops, and running shoes, their long dark hair pulled back into cute ponytails. They're packing towels and water bottles into their gym bags.

"Feel like a work-out, babe?" Jenna asks. You agree, and grab your own gym bag.
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The gym is a large, open room, with tall windows. There are lots of exercise machines, open spaces for stretching, and glass doors facing onto the tennis courts and swimming pool. Other doors lead off into the sauna, showers, and change rooms. The gym isn't too busy in the middle of the day, but there are a few other people around, a couple women playing tennis, and more out in the pool.

The three of you do some stretches together, and then hit the weight machines. You enjoy watching the two hot sisters' firm young bodies moving in their tight workout clothes, and your own body feels really good from the exercise. Jenna and Jessie are sweating, their skin glistening. The thought of fucking them here in this public place turns you on. Or maybe you could pick up another hard-bodied young hottie to take home. You glance around at the other women working out, and wonder if any of them are sisters.