Mark and Cal wonder though the various sidewalks, following the signs to the wave pool. They find Katy sitting in a lounge chair talking to a short, stocky man.
The two 'ladies' sit down in a pair of nearby lounge chairs, and wave to Katy. Katy sees the two and waves back. The man Katy was talking to looks over to Mark and Cal, then hands something to Katy and walks away. Mark and Cal get up and stand next to Katy.
"Damn Cal, your suit leaves nothing to the imagination. Your erection is over halfway to your breasts." said Katy, who just stared at her brother's torso.
Cal looked to his sister, "It's the collar. I'm constantly aroused, and I am constantly thinking about sex. When Mark was wearing it earlier, he was the same way, and just looking at his cock filled my mind with ways to satisfy my needs."
Mark smiled, "That's why I switched. I don't feel the need for constant sex with the dildo filling me."
Katy looked at the two, "Had any fun yet?"
Both Mark and Cal responded in unison, "Hell yes!"
Cal said, "It must be the collar, because I love how people can't get enough of me. Their stares become lustful gazes."
Mark added, "Two guys in line were too frisky, now they are very frisky with each other. Another perv got what he deserved."
Katy added, "Well, it's still early, the crowd is light and very few kids, mostly college aged, like us." Mark and Cal nodded.
Mark looked down to Katy, "Want to join us for a volleyball team?"
Katy shook her head, "No thanks. That guy I was talking to will be back. He has a shemale fetish, and offered me $500 to hang around him for the next few hours. Mark told Katy about the unused office and the key in the flower pot, and Katy was very happy with that. "Good, we should have plenty of money for the club tonight. The mall was expensive today, and I should have more money later. Cal, you can't tell our parents."
"What, that your a high class, high dollar, shemale prostitute who looks like the ideal wet dream of her brother? smiled Cal, "Nope, I won't say a thing. If he wants more, me and Mark are available."
Mark looks at Cal, "Wait a minute...I didn't volunteer yet." Mark looks to Katy, "If you need me, I can. Collar boy here can use a good pounding."
Katy smiled, "You two go over to the beach volleyball area then, and if he's got the money for more, we will stop by."
Katy settled back in her chair, while Mark and Cal headed over to the beach volleyball courts. Several games were going on, and there was even a two man competition.
Mark suggested, "Let's see if they will let us register as women." Mark and Cal went over to the registration table and asked if they could register in the women's bracket.
The man behind the table said, "Sure, just sign in right here and we will call you. Just wait over in the chairs by Court 2." The man's eyes never went below the two sets of large, creamy breasts pointed in his direction. "Thank you ladies" the man said as he took the completed paperwork and added Marie and Kay to the women's bracket.
Mark and Cal played well, but their coordination with their huge breasts was a constant problem in their matches. After making it past the first 2 teams, they lost their third match, and then lost the losers bracket round. The afternoon shadow slowly reached the chairs where Mark and Cal were watching the remaining matches. The coldness of the shadow sent Mark and Cal looking for Katy. After arriving back at the wave pool, Katy could not be found.
"It's after 5. If we don't find Katy soon, I need to visit with you in the ladies room." said Cal.
Mark let out a deep breath while saying "Fine, fine. You've held it this long. Let's go check out the office."
After snaking through the various sidewalks, they arrived back at the office, but with the lights on, and the door slightly open. Peering inside, Katy busy with simultaneous sex with two men, the short man from earlier, and someone else. Both Cal and Mark stepped inside quietly, and closed the door. Cal reached into his suit and started to masturbate, with Mark doing the same after noticing Cal's stroking. The second man looked a lot like the stocky man, and had his cock buried in Katy's ass while Katy's cock was pumping into the stocky man. Katy's pumping stopped, and pushing both Mark and Cal over the edge as they ejaculated into their swimsuits. The second man's body tensed as he slowed his thrusting. A few moments later the second man sat on the floor, his cock shrinking while Katy remained tied.
Mark was the first to speak, "You didn't invite us?"
Katy's face was shiny with sweat as she turned to look at the door, "Oh, you guys..." Katy panted, breathing heavily. "Get over here."
Mark and Cal stepped over to the couch and sat down, still lightly stroking their cocks and teasing their engorged knots. After a couple of minutes, Katy's cock slowly slipped out of the stocky man's stretched ass and Katy stood up. "Are you two up for a challenge?" asks Katy.
Cal says, "Sure"
"We are leave now with these men, go to their bank before it closes, and then to their house." directs Katy.
The two men quickly put on their swim trunks and the five work their way back to the changing rooms, where Katy gets her purse, and return to their cars, with Katy driving. Katy follows the two men to the bank, where she goes inside.
"I am going to miss this when she's gone." says Cal.
"Me too. I love this body. Do you want to stay like this with me?" asks Mark.
Cal says, "Wow. I wanted us to be the same as we were, but the same...we would need new IDs and such."
Mark shakes his head, "No we wouldn't. We just get new photos on our IDs. Say it's hormone treatment and surgery. It will not be easy, but we could both stay this way."
Cal says, "We should think on that idea. Life would be easier if we looked like our original selves."
Mark reaches up and slips his hand inside Cal's swimsuit, "Yea, but we wouldn't have these."
Cal returned the favor to Mark, enjoying the nipple tease. "Good point. What about trying other forms?"
Mark said, "Yes, we still have other forms to try."
Katy and the two men exit out of the bank, and Katy gets back in the car. "They have the money. Now it's up to you two to deliver. They have some changes the want." notes Katy. Katy follows the men in the car to a nice house in an upscale neighborhood. Katy and the boys follow the two men inside the house, and into the back yard, where there is a modest pool and a small sauna. Katy, Mark, and Cal sit in the chairs next to the pool while the two men walk back into the house. Katy turns to Mark and Cal and says, "The two brothers want to change with their wives."
Mark turns to Katy, "Kinky stuff?"
Katy says, "I don't know. They pulled out nearly $25000."
Soon, the door opened, and four naked people walked over to the pack. The short, stocky man said, "Thank you for coming. Katy spoke highly of you two. I am Steve, this is my wife Becky. My brother, Jeff, and his ex-wife Allison. Jeff and I have talked about this, and Jeff goes first."
Allison stepped up, and asked, "Are there any limits, boundaries?"
Mark said, "Yes, but this isn't an exact science either. Strong desires have a big influence. You will become partially canine."
Allison continues, "OK. I want Jeff to be a bitch in heat, and my new cock is the only thing that can satisfy him and he is the only one who can satisfy me."
Cal asks, "Is that it?"
Allison's eyes tear up and she steps back into Jeff's arms. Jeff adds, "I cheated on my wife while we were married. She divorced me, and took our kids, but she still loves me. I didn't want to hurt her. I don't care if you make me her cock slave, I want to make sure Allison is happy."
Cal and Mark get out of the chairs and dive into the pool. Mark asks, "Go on and get in here with us." to Jeff and Allison. Mark and Cal take off their swimsuits, and toss them into the chairs. After Allison steps into the pool, the four of them look at each other in water waist high. Cal steps over and puts the collar around Allison. Cal slides his cock at Allison's human pussy, and slides in. After Cal's orgasm, his knot keeps his cock firmly inside Allison. The tears on Allison's face are gone, now a look of lust consumes her. Mark comes over and once Cal softens enough to slide out, Mark slides his cock into Allison and does the same. Cal steps around the back of Allison, and slowly slides into Allison's ass. Cal's recent orgasm lets him outlast Mark, and soon both canine cocks are firmly held inside the woman. Cal looks over to see Jeff is slowly stroking his cock, thin trails semen floating around him.
Mark and Cal soften close to the same time, and slowly pull out of the woman who needs more. Mark begins to whisper softly into Allison's ear. Cal reaches under to Mark's pussy, and grabs the dildo, slowly pulling it out. Cal gets ready, the dildo at the entrance to Allison's pussy. Mark continues to whisper for a few minutes then slowly removes the collar. Once the collar is away from Allison's neck, Cal slides the dildo into her slick pussy, and begins to pound away. Cal and Allison back up until they are at the edge of the water, as Cal slowly directs Allison to sit down and lay back. Allison's breasts have already changed, bigger, rounder, puffier nipples. A new scrotum is now brushing against Cal's hand as he continues the dildo thrusting. A black furred sheath forms. Soon Cal notices the dildo is not going as far in as it should, he continues to gently slide the dildo in, until Allison's pussy becomes smooth skin. Mark comes over and takes the dildo from Cal and slides the dildo into Allison's sheath, and starts to thrust.
Mark smiles back to Cal, "Her sheath is a pussy, but it can push out into a large cock. Her scrotum isn't big. This way she won't draw attention when wearing a bikini like we did today. Mark smiled as a pink cock grew from the sheath, with the dildo buried inside it. Mark noticed Allison's body thrusting her hips into the dildo, and soon felt pressure forcing the dildo out. Jets of her new canine cum were leaking around the dildo. Mark added, "She's an alpha female with the urges of a male. I don't think she will be disappointed with the results." Allison remained on her back by the pool, as the remains of her first male orgasm slowly fade.
Mark gets up and motions for Cal to follow as they approach Jeff, who is continuing to stroke his cock. Jeff is silent as Mark hands Cal the collar, who then puts the collar around Jeff's neck. Mark begins to whisper into Jeff's ear. Cal grabs the dildo from Mark, and slowly slides it between Jeff's ass cheeks, ready for the next phase.