Over the desk

With Mac dressed only in her wide open jacket you step back and admire the view. "Major, we're going to perform a little manovre here. You are going to turn around and bend over your desk, then I will give you a treat."

For a second you think Mac is going to refuse but then to your amazment she not only bends over the desk but reaches behind her and pulls her ass checks apart. looking back over her shoulder she sees your stunned look and says "welcome aboard sailor" with a laugh.

Freeing your dick in record speed you walk up behind her and slowly run a finger around her puckerd asshole. Sliding your hand underneath you moistean it in her pussy the slowly push it back into her ass, useing her own juices as lube.

With a moan Mac begs for you to take her, withdrawing your finger you press your dick against her whole then with a hard push shove it in. You are amazed at how tight it is but as you begin building up a rythm it grows even tighter as Mac clenches. At the start Mac's grunts and moans were half pain, but now she starts thrusting back into you and screaming with pleasure.

Her large brests bouncing with each thrust Mac yells, "OH GOD YES, FUCK MY ASS, OH YEAH RIDE ME LIKE A DIRTY WHORE". Hearing make talk like this pushes you over the edge.