Leo's 16
Don's 15
Raph's 15 (two months younger than Don)
Mikey's 14

Raphael stretched out lazily in bed and looked lasciviously at his mate, Leo. "Wanna go another round?" he asked.
"Raphie, you're incorrigible," Leo said. "We've already had four rounds. I'm pooped."
"I wanna be a dad and raise a baby with ya. Can ya ditch the condoms, so we can try?"
"I don't feel ready, Raphie. Please can we wait a bit longer?"
"All right, I guess, but yer gonna have my baby first and not Mikey's."

"What's this about babies, bro?" Mikey asked, bringing breakfast on a tray and settling it on Leo's lap. Leo looked at his other mate gratefully and said, "Thanks, Mikey."

"Hey, where's mine, Mikey?" Raph asked.
"Go get your own. This is for me and Leo."
"Jerk. Yer still jealous that Leo also loves me, ain't ya?"
"Nope, because Leo loves me more, don't you, Leo?" Mikey said, shoving a piece of bacon into Leo's mouth.

Leo chewed, swallowed and said, "I love you both so much in different ways. Raph, I love your passion, your fiery nature, the way you make me swoon every time I'm with you. Mikey, I love your gentle, easy going nature. You're a sweetheart and you both make me so happy. I couldn't imagine life without you two."

After breakfast, Raph pounced on Leo, nipping and licking him all over, spreading his legs wide and lining his cock at Leo's entrance. "It's my turn," Mikey said crossly. "Shove over, Raph."
Raph bared his teeth at Mikey and said, "Back off if ya know what's good for ya. Leo's mine!"
"He's also mine!" Mikey yelled. "You never let me have him."
"We can screw him together, okay?"

"Can you two please stop fighting?" Leo said. "And just fuck me already." His mates didn't need to be asked again and Mikey also lined his cock at Leo's entrance. As his mates' cocks sunk into his puckered hole, Leo moaned in a mixture of pain and pleasure, especially when they struck at his sweet spot, causing him to let out a deep churr. "Go faster," Leo begged. Needing no more encouragement, his mates thrust in harder and faster, both churring loudly, until they came with a deep roar and emptied their essence into Leo's hole. Leo came a minute later, panting heavily. "You two are incredible," he said, watching his mates pull out. "I'm so lucky to have you."
"We're the lucky ones, Fearless," Raph said, bending down and nuzzling his cheek. "After Don dumped me, I thought I'd never find anyone else, but then ya and Mikey invited me ta be with ya and I've never been happier."

"And being such an alpha, you took over," Mikey said heatedly. "I love you as my bro, but you need to back off and let me also have time with Leo. He was my mate first."
Raph shrugged. "Can't help it. That's who I am. I know ya want me ta leave him alone completely, but I ain't gonna, so get used ta it. I'm here ta stay."

Leo didn't bother to intervene. It was the same old argument every time. Mikey and Raph loved each other as brothers, but that's where it ended. And Mikey was still growing used to sharing Leo. It had been Leo who'd suggested that Raph join them, because Raph had been lonely after breaking up with Don. Mikey hadn't been overly thrilled, but had gone along with it, because he loved Leo, and if Leo had to be honest, he'd always had a deep desire for Raph, so he'd been excited when the hothead had come into the relationship. He had the gentleness of Mikey and the passion that was Raph, so he considered himself very blessed. And if he had to be honest again, he did love Raph more and only wanted Raph as his mate. But I can't break Mikey's heart and dump him, Leo thought. It would destroy him.

"Ya look deep in thought, Fearless?" Raph said. "Ya okay?"
"Fine, Raphie," Leo said, looking lovingly into his favourite mate's golden eyes. "Why don't you go turn on the shower, Raph, and wait for me? I'll be there in a few minutes."
"Okay, Fearless. We gotta christen the shower, though." Leo smiled and playfully swatted his rump.

Don happened to be passing the bedroom and peeked in through the keyhole. It's not fair, he thought. I should be with Leo and I want a baby. I'm going to make Leo mine whether he likes it or not. Don was about to go to his lab, when the door opened and Raph appeared. He stared angrily at Don, arms crossed, and demanded, "Ya were eavesdroppin', Don?" / "No, Raph," Don said, looking at his ex-mate."
"I should hope so. It'd be kind of sick if ya were."
"Why would I? I'm happy for you, Raphie. You have Leo, who've you always wanted."
"Yeah," Raph said, smiling so smugly, Don wished he could punch him in the face. "Leo's amazin' and we're gonna have babies."
"Leo's gravid?"
"No. Not yet, but someday he will be. I love Leo. I ain't a sap, but I do love Leo. He makes me feel so fuzzy inside and all I wanna do besides fuck him, is make him happy. I'm gonna get some breakfast. Later."

Don formulated a plan as to how he'd get Leo alone. Tonight, he thought, but I have to make sure Raph and Mikey are busy and I know just how.

Meanwhile, Leo was talking to Mikey. "I know you still resent Raph," Leo said. "But he's lonely and he needs us. Please be nicer to him."
"I can't stand his arrogance, bro. He thinks he's some Greek god."
"I know, but he needs this…Needs us, Mikey."
"You really love him, don't you? More than me."
"Of course not. I love you both equally, Mikey," Leo said and kissed his beak. "And I'm bonded to you both. Now and forever."
"I hope you mean that, Leo. I couldn't stand losing you."
"You won't. I'm going to shower. Why don't you pick a movie we can all watch afterwards?"
"Sure. Hey, Leo? I love you so much."
"Love you too, Mikey. Later."

Don was in his lab mixing a concoction of drugs designed to get what he wanted and to keep Raph and Mikey occupied. When he was done, he smiled and thought, it's ready. I can't wait until tonight. I'm going to do it at lunch.

When lunchtime rolled around, Don offered to make lunch and spiked Mikey, Raph's and Leo's sandwiches with the potion. Then he called them all to lunch. As they tucked in, Raph said, "This sandwich tastes strange, Don. What did ya put on it?"
"Salami, Raph," Don said, rolling his eyes.

"It does taste a bit funny," Leo said. "Don, you sure the food's fine?"
"Yes, I have the same as you."

"I don't know, bro," Mikey said, setting his half-eaten sandwich aside. "It does taste a bit funny."
"Then make your damn own lunch," Don said irately. "It's just salami."

"Maybe we're overreacting," Leo said. "I'm sure it's fine." His mates nodded and, trusting him, ate the rest of their food.

After lunch, they were on a sewer run when they were ambushed by Slash and the Rat King. For some reason, the two seemed to have united, determined to destroy the turtles. Raph advanced on them, gripping his sai menacingly, when suddenly, the potion affected him and he collapsed onto the ground. "What's goin' on, guys?" he managed to ask, before his eyes slid closed.

But Mikey and Leo couldn't answer, because they'd also collapsed. "What the hell's going on, Donatello?" Slash wondered, quirking an eye ridge.
"You like Raph, don't you?"
"Very much."
"Well, he's all yours. Rat King, you can have Mikey, but leave me Leo. I want him."

"Why are you doing this?" the Rat King asked.
"Because," Don said. "I want Leo and this is the only way I can have him all to myself. Do you want them or not?"

"Yes," the Rat King said and picked up Mikey. "I can keep him?"
"Of course," Don said. "Have fun."
"Goodbye, turtle," the Rat King said, quickly walking back to his home.

"Raphael mine forever, Donatello?" Slash asked, leering at the passed out red masked turtle.
"Yes. Raphael likes it rough, so give him all you've got."
"I will," Slash said, picking Raphael up in his strong arms. "I'm going to pound him hard and deep! Goodbye," Slash added, running off with Raphael.

"Now it's just us, Leo," Don said. "Your mates are gone, Dad's away for the next month, so we're going to have a blast." Don slung Leo over his shoulder and raced home, eager to claim Leo as his.