Susan.

My rational brain wanted me to stop thrusting so I could switch back to Catherine but my primitive lizard brain took over -- I needed to keep fucking Susan until I overflowed her womb with my semen. I squatted behind the Chinese beauty and pushed her face down to the mattress so I could sink my cock deeper into her sodden cunt.

"Sorry," I apologized to Catherine while I continued to pound away at Susan's quivering pussy.

"It's okay," she smiled. "It's her second last day so fill her up with your baby batter!"

"Oh, I definitely will!" I grunted, jamming my dick hard into Susan's cunt. Her moans were muffled by the blanket as my loins loudly slapped against her ass faster and faster.

However, I was getting greedy. I wanted more of my cock deeper into her heavenly pussy.

Susan was so consumed by her multiples orgasms that it barely registered to her that I had suddenly pulled out, leaving her convulsing pussy empty of cock. I roughly rolled her over onto her back and she instinctively spread her legs wide apart for me, allowing me to slip the tip of my cock past her soaked pussy lips.

"OH GOD YES!" she cried out when the full length of my thick cock filled and stretched her hot, tight carnal tunnel.

I throwing her legs over my shoulders, I leaned forward to raise her ass slightly off the bed to give me a much better angle of penetration. My face hovered over hers and we smiled at each other.

"I want your baby, Mike!" she purred before pulling my head down to kiss me fiercely.

Yup, she was definitely bi.

I kissed her back and instead of the unadulterated sex we had before, we did what my wife would consider "making love," albeit hard non-stop fucking. Susan had only been in relationships with women but it was quite apparent that she was open to be fucked by a man (at least with my dick) and I was more than happy to oblige her. We were lost in each other's mouths, completely forgetting Catherine's presence, as I kept pumping, bringing her from one orgasm to the next. I finally broke our kiss when I sensed I was about to cum.

"AH FUUUUUUCK!" I roared into her neck when my cock jettisoned a stream of semen into her womb. I kept thrusting until I emptied my balls into her. We continued to kiss until I felt my cock soften and reluctantly pulled out with an audible slurp.

"I better be pregnant after all of your semen in me!" Susan giggled, scooping up the leaking jizz oozing out of her snatch and putting it back in.

"We still have tonight to make sure," I chuckled, lying down next to her.

The two girls snuggled against me as we took a much needed rest.