Behind Anna's sister

You place yourself behind Anna's sister. You realize you won't be able to fuck her the way she is, so you take action to make the position right. "Hey Anna," you say to get her attention, "You mind kneeling down, love?" she obeys your order promptly. Now Anna's sister is on all fours, prime position for anal.
You spit on your first two fingers. You don't hesitate to shove them in and spread it around. You gently finger her hole, feeling it pretty loose you suspect she has taken Anna's monster. You spit in your other hand to lube up your shaft. You spread the slippery liquid over the entirety of your shaft, slowing down on parts to wring out the pleasure.
Now that your cock and her ass is lubed up, you slide your cock inside of her. She moans over Anna's monster. "Hey, what is your name?" you smack her ass as you say it. She pulls all twelve inches out from her throat.
"Mmh, it's Daphne." she moans while she says it. She moves to suck on the dick in front of Er only to find that it is gone. All of a sudden, you feel three lubed up fingers enter you. You gasp in shock and in pleasure. You get an odd mix of a smile and a frown when you realize she is going to fuck you, while inside her sister no less! Your train of thought is interrupted when you fee another two fingers enter you. She could fit her whole and inside of you now but she doesn't, instead she pulls out and replaces it with her monster dick. You moan and feel yourself leaking precum inside Daphne.
"All right, you have control now." Anna says as she starts fondling your chest. You slowly move your hips backward, simultaneously pulling out of Daphne and pushing Anna inside of you. Anna leaks juices into your hole making the whole thing go smoother with each passing minute. You get use to the feeling and start to go faster. Your cock slides into Daphne as your balls hit hers, then you slide out and Anna's balls slap yours. This whole process makes it unbarable. You lay over Daphne, your tits pressed against her back. You wave your hand, trying to find the smallest dick in the threesome. You feel her cock leaking precum like a faucet onto the floor. That makes it easy for you to jerk her off. Your fist pumps up and down her meat as your own meat pumps in and out of her, and her sister to you. You hear her scream as you feel hot cum on your hands. She clenched around your dick as you have her lick the cum off your hand. The extra pressure throws you over the edge and you cum inside of Daphne. Your ass does the same to Anna and she she moans, "Get ready, girl! I'm cumming!" she cums inside of you, much more than you did in her sister. What else would you expect from balls of that size?
"Damn, girl! You have yourself some stamina!" She says staring at your cock, still hard. "Why don't you let Mama Ann take care of it?" she says in a codling voice.