Both of them.

"Guh!" was all the warning I gave them before the first spurt of semen splashed in Deborah's fertile womb. I would have kept pumping more of my baby batter in her if Susan hadn't looked over her shoulder and begged me to cum in her too. Having had practiced with Emma and Sam, I waited between squirts to pull my dick out of Deborah's tight cunt and shove it into Susan's even tighter cunt. I rested my hands on her cute little ass and pounded away as if I was the last man on Earth trying to repopulate humanity.

Even after I had finally emptied my balls into Susan I kept pumping until my cock was flaccid.

"You did good, honey," my wife whispered and kissed me on the cheek. "Now lie down and rest."

I reluctantly pulled out of Susan with an audible slurp and collapsed on the bed while Sam scooped up any of my precious seed leaking from her friends' pussies and inserted them back into them. In the afterglow of the long fuck, all three girls laid next to me in a group cuddle until we all drifted to sleep.