"You probably don't know this Mary, but a futanari's cock, especially the tip, is very sensitive. Stick your cock into my cock and begin fucking it." Commanded Prickta. Mary didn't have much of a choice, and proceeded to do as she has been ordered to do. She knew this was going to be a very frustrating time for her.
Surprisingly however, she didn't have such an experience. Prickta stood by her words, that if Mary behaved, Prickta would make sure that Mary is enjoying it too. Mary didn't know why, but sliding her cock in and out of Prickta's was really making her feel good. So good that she actually wasn't planning to stop doing it anymore, unless Prickta told her to.
"See now my little dickgirl pet? If you are good, I will be gentle with you and we both can enjoy this together. Your body is now specially designed for pleasuring a futanari after all." Said Prickta.
Mary looked up at her captor/new master. "...designed?" She asked mid thrust.
Prickta nodded. "Yep, you are not just small and with a dick over 1/6th your body size in length. No, your body now reacts to contacting our futanari body. You become very submissive, and also a lot more eager to feel pleasure. You also after making your first direct contact with a futanari, will be unable to cum unless that futanari permits it, as a sign of you now belonging to them. Which is now your case as well. Observe, you will now cum Mary." Explained Prickta.
Hearing this, Mary's body suddenly goes into pleasure overflow and she instantly climaxes, shooting her entire load down the inside of Prickta's cock. Mary hadn't even felt this good when she had gotten herself off before being captured. However unlike before, she didn't stop cumming. Not didn't, but couldn't. Her body refused to stop. Just more and more of her cum just kept flowing down Prickta's cock's interior, much to the futanari's own enjoyment.
"Alright you can stop cumming now" says Prickta. And like a switch had been flipped, Mary instantly stops cumming. Prickta lifts her up and licks up the remaining bit of cum hanging down off of Mary's cock with her tongue before letting out a satisfied sigh. "That was a good job Mary. My cock is very pleased now. And so I will offer this deal to you. If you agree to become my exclusive toy and from now on, and promise to willingly and obediently serve me. I will overlook the other dickgirl presence I had picked up. What do you say? Become my toy willingly and spare your friend and I will also treat you well and with care. Or be forced to be my toy, and be joined by your friend as I use the two of you until you break? You have 10 seconds to answer."