Erin.

Unless you suddenly mutate a second penis you can only fuck one of the girl's pussy at a time — the position they are in will test your endurance as you try to please both of them. Since Erin begged you to make her cum again you are happy to comply.

"Oh fuck yeah!" Eric cheers when she feels the full length of your cock being shoved into her hot cunt with one hard stroke. Resting your hands on Samantha's ass cheeks, you starting pumping away. The blonde's loud moans are silenced by her lover's mouth. With the oral and vaginal stimulation it does not take long for Erin to climax. You do not linger in her spasming pussy long enough to enjoy the contractions around you cock but you unceremoniously pull out and slide your dick into Samantha's soaking wet cunt.

The redhead breaks her kiss and pushes herself up enough so that her large tits swing violently above her lover's face. Even though you cannot see from your angle you suspect that she let out a moan when Erin latched her lips around one of Samantha's nipples. That picture in your mind excites you even more and you slam harder and faster into the redhead's pussy.

"Fuck her hard like the way you did to me!" Erin orders.

So you do and it does not take long for Samantha to climax.

"Yeah, that feels good, doesn't it, baby?" the blonde purrs. "You love being fucked by a real... UMPH!"

You interrupt the blonde by jabbing your cock deep into her cunt.

"You love being fucked by a real cock too!" Samantha giggles as you madly thrust away at the blonde's hot, tight cunt.

Every time each girl cums you switch to the other girl's awaiting pussy, bringing her to orgasm before swapping pussies again. Eventually it becomes a blur, you lose track of whose pussy you are fucking and are just concentrating on lasting as long as your stamina can allow. However, it when finally comes to the inevitable you pull out and let out a roar as your cock spews thick jets of jizz on both of their reddened snatches.

"Holy shit..." you sigh, collapsing to the floor with your flaccid cock on your thigh.