Yes

Anna's attention was largely fixed on my face, which was no doubt shifting through a series of rather interesting expressions as Mike's cock slid in and out of me with deep, steady movements.

So as I remembered her promise to let me enter her pussy at long last, Anna caught my pleading glance right away, and smiled lustfully.

"Oh that's right...since you're using my favorite cock, I was going to use yours."

Anna slipped over to Mike's side and whispered into his ear, prompting him to grunt in assent to whatever she said.

A moment later, Mike's cock slid out of me, leaving my ass feeling relieved, but oddly empty. A moment later, Mike's strong arms lifted me from the bed and manhandled me easily, turning me over and leaving me a position as if sitting in Mike's lap as he sat on the bed.

My anus' reprieve ended as soon as he had re-positioned, and I let out a small girlish moan as Mike used my own body's weight to slide me down onto his upright cock. Feeling exposed and weak, I hung in the air as Anna lay down on the bed in front of me, legs spread and pussy soaked with obvious excitement.

"Put her in me." Anna's voice was a seductive purr as she urged Mike on. Completely helpless, I moaned weakly as Mike's movement made his cock shift inside of me, and in only a moment, Mike had me half-suspended over Anna, my throbbing, leaking dick inches away from Anna's waiting slit.

Mike's hips pushed me from behind, and I fell forwards onto Anna, my face nearly touching hers. I could feel her entire body underneath mine, and her flushed face, coupled with the wetness I could feel as my cock brushed by her pussy let me know she wanted this almost as badly as I did.

Lifting her hands to cup my face, Anna whispered sweetly up at me as I shifting my hips desperately, trying to slip inside of her.

"Let Mike guide you in Selina...he knows his way around my body."

Her words filled me with jealousy, but I was so eager to finally fuck Anna that I relaxed, letting Mike get a firm grip on my hips. In moments, I felt my cockhead pressing against Anna's wet hole, and with a hard thrust from Mike's cock, I was in.

From the way her pussy squeezed down on my cock, Anna was elated to feel me inside of her, but not as much as I was. My first instinct upon feeling how wet and welcoming my sister's hole was, was to begin thrusting into her with all the lust I'd built up over the past week or more...

Unfortunately, Mike had a tight grip on my hips still, and unless he eased up, there was no way I'd be moving on my own.