Both at the same time

"Stay on all four." you order. "I want to fuck you doggystyle."

"Ho, yes!" they exclaim, and they turn around to present you their sexy booties. "Which of us will you honor first?" Lara asks, worried. You use your omniscience to read her mood and understands she's eager to receive your 'gift' but doesn't want to see her little sister left alone. You smile, as you just figured out a way for everybody to be happy. Suddenly, there's not one but two identical Michael standing behind your sisters, both sharing thoughts and sensations, and both equally well-endowed.

"Both." you answer with the same voice. And you suddenly grab your ravishing lovers before entering both of their pussies at the same time. Your sisters arch and moan, waving their hips frantically. The pleasure they feel from the touch of your penis alone is equal to an orgasm for a lesser woman, but you make sure it will be far from enough to make them come. You also make their vaginas and assholes even tighter than they were before they lost their virginities and unable to get permanently stretched out.

Louder grunts start escaping from both of your throats, as your dicks are pressed in those brand new pussies. It doesn't prevent you from going faster and harder in them, increasing their cries in return. They shut their eyes and hold each other's hand, while you start smacking their sexy asses to encourage them.

After a few minutes, all three and a half of you come at the same time and the sum of your pleasures could produce more energy than a nuclear blast. Your sisters yell so loud that they empty their lungs and almost faint. You fill their bodies with your semen and get out of their pussies to finally return to one single body and embrace them tightly in your strong arms.

"I love you, girls."

"We love you too, master!" they answer.