She takes control

You pause for a moment, feeling your ass wriggle around the intruding object, you take some time to think about your next move... too much time. You gasp as you feel the dildo quickly slide back.

"Wait! I'm about to..." You shout, but it's too late as Erica slams back in. You collapse onto Olivia's back, overwhelmed by the intense sensation.

"No need, you're clearly a natural sub." Erica says as she once again pulls back. "It was wrong of me to expect more from you." You feel her hands place themselves firmly on your hips. She pulls you back slightly, inching your own cock out of Olivia. "and now it's my responsibility to fuck both of you." Before you can make any form of response, she thrusts back into you, forcing you forward. You feel your balls slap against Olivia as you are pushed as deep as you can go. You think you can hear a muffled moan coming from Olivia, but through your heavy breathing you can't be too sure.

You're suddenly yanked back, though the cock inside of you doesn't pull out as much as before.

"Now that your ass has had time to get used to its new friend, we can really begin." Erica says. You can't even get a thought out as she pushes back in, this time with even more ****, slamming you forward once again. She wastes no time pulling back and doing the same thing again, and again, and again. You feel your insides stretching from pure **** alone.

"Gaahhhhh!" You grunt. This doesn't do anything to stop Erica's rapid pace, as she continues her aggressive thrusting.

You can feel Olivia shaking underneath you , though it's hard to pay much attention to what you're doing to her as your mind is consumed by the feeling in your ass.

You let out a sigh or relief as Erica pauses for a moment. You feel her hands leave your hips moving forward to grab Olivia's. Your relief is short lived as she goes back to pounding you, this time using her grip on your girlfriend to **** in even deeper. She keeps going, showing you no mercy. You're not sure if you're body is beginning to get used to the feeling, or just numb, but it no longer feels as painful, still intense, but it's now a stranger, wilder feeling.

"Oooooh GOD!" You shout. The tone of your voice almost unrecognizable to you, as it's a loud wailing moan. Though it's hard to focus on any feeling other than the rapid ass stretching, you can feel your cock begin to twitch.

"Mhmm. You're not about to cum in your mistress are you?" She asks, not skipping a beat in her motions.

You can tell by the tone of her voice, that that's something you shouldn't do, but all of the feelings inside of you are reaching a level of intensity that you've never experienced before. You don't know if you have any control over your body at the moment.