Behind Anna

You walk to Anna and, with one swift movement, bend her over and shove the first three inches of your cock into her ass. She gasps at the sudden penetration. "No, YOU will be saying my name." you say with a small hint of a purr.

The three inches of your member grew to four... then five... still you enter the twin at a slow rate until your entire nine inches are inside. Her heavy breaths turn into a slight gasp as you pull out.

You thrust in again. Pleasure tingles through you as you pull out. You repeat the process many times. Sounds of wet skin on wet skin echo through the stall. Then a voice breaks the rhythm. You look over the shoulder of one twin to see the other.

"Sis, my hole is aching for you." she whines, slowly toying with her ass. You see her lie down on her back, legs spread and dick at full attention.

The hands of the twin you are fucking, scratch that, were fucking, **** you out of her. She falls to her knees and places her head on her sister's opening. In the time it took for the feet of the twin to fall onto Anna's shoulders, the full twelve inches were planted firmly in her ass. Her moans filled the entire bathroom. If you weren't worried about cumming, you would have cared about the noise level.

You fumble to get back into your place inside Anna, but you are soon in place. You let Anna be completely inside her sister before you enter her. Anna pulls out, and you continue to enter. She thrusts, you pull out.

Another voice breaker the (new) rhythm, "I'M COMING!!!"