Master Splinter walked into the dojo and saw that Leo there; training hard. He just stood there and watched. 
Leo slashed his swords at imaginary opponents. 
He then sheathed them and walked over to Raph's punching bag and started kicking and punching it.
Once that was done, he started tumbling on the floor and performing backflips. 
He was so engulfed in what he was doing, he didn't notice that his sensei was in the room. Until he landed from his last backflip, he was totally taken by surprise. There was a grin on Splinter's face. 
'Master Splinter!' he exclaimed. 'I didn't see you there.'
'Do not be alarmed, my son,' Splinter spoke softly. 'I did not mean to startle you.'
Leo was panting and wiped sweat from his brow. 'I must say, Leonardo,' he continued, 'that I am very impressed by what I have seen.'
'Thank you, sensei.' Leo sat down on the floor and allowed himself to catch his breath. He also took a sip of water from his water bottle.
'But,' Splinter's expression had become serious, 'I do not want you to overdo it. You might injure yourself or worse still, over exert yourself to the point where you'll fail in battle.'
Leo, once he'd gotten his breath back, stood up and looked Splinter straight in the eyes.
'I won't sensei,' he said reassuringly. 'I just, needed some time to myself.' 
Splinter was confused. 'But why, my son?' he asked. 'Is something troubling you?'
'No,' Leo answered. 'I just needed to think.'
Splinter was about to ask his son why did he need this alone time but decided not to push it. Besides he knew the things that Leo would often have to deal with; the responsibilities as leader and also, as older brother.
'I know the weight of the responsibilities that you carry, my son, and I am very proud of you for doing so, as I am proud of all of you,' he said.
'Thank you, Master Splinter.' Leo smiled.
'But, as Michelangelo would say, you must learn to "relax" once in a while.' Master Splinter was never really good at using words that the Turtles would use as they sounded completely foreign to him. 
Leo half-smiled. 'I'll keep that in mind, sensei.'
'Good,' Splinter said matter-of-factly, and then, put a reassuring hand on Leo's shoulder. 'I am going to bed now,' he said. 'Please do not work yourself too hard.'
'I won't, sensei,' Leo assured him. 'Good night.'
'Good night, my son.'
Splinter and Leo bowed. Leo watched the old rat leave the room before getting back to training.
---
Splinter closed the door of his room and untied the belt of his kimono. He took it off, folded it neatly and placed it on the bedside locker. He wasn't tired yet so, he lit a single candle and sat down on the floor. He took in a few deep breaths and closed his eyes. In all honesty, he was a little worried about Leonardo so, he hoped that meditation might take his mind off it.
He felt himself growing calmer and more relaxed. 
A few minutes later, he heard a knock at the door. 'Enter,' he called out.
He heard the door slide open and then, slide shut. 'I'm sorry to disturb you, sensei,' Leo said apologetically.
Splinter opened his eyes and looked up. 'Do not worry yourself,' he said. 'How can I help you, my son?'
'I just, get so worried sometimes.'
Splinter raised an eyebrow. 'Worried?'
'Worried that I'll fail you, and I'll fail my brothers.'
'And is that why you were training alone tonight?'
Leo said nothing and just nodded.
'Come, my son, sit with me,' Splinter asked. 
Leo did what he was asked and sat down next to his master.
'Do not worry about such things,' he said softly. 'You will never fail me, or your brothers.'
There was a look on Leo's face that suggested that he didn't quite believe Master Splinter's words. He put a hand on Leo's shoulder and said, 'I really do mean that, my son. I would never lie to you or your brothers.'
Leo turned his head and stared into the old rat's eyes; they were soulful and sincere. They leaned closer to each other and kissed. Leo broke off the kiss and looked down, he could see that his master's cock was twitching. 
Splinter watched him stand up and take off his mask, his belt, his swords, his knee and elbow pads. Leo then got back down on all fours and leaned forward. He grasped Splinter's increasingly hardening cock.
He smiled and said, 'Let's do some training together, sensei.'
'All right, my son,' Splinter said. Leo could see that his master's cheeks were burning bright red, which made it all the more delightful for him.
He leaned in closer and Splinter could now feel Leo's breath on his cock. Leo stuck out his tongue and started licking the old rat's balls and cock as if he was licking a popsicle. Splinter closed his eyes tightly and started breathing heavily. The sensation of Leo's tongue on his cock was so delightful.
Leo then worked his way to the tip and in fell swoop, took all of it in his mouth. 'AAH!' Splinter cried, throwing his head back.
Leo sucked gently as he moved up and down slowly, his tongue was gently caressing it. 'That's it, my son,' the old rat said; the pleasure was overtaking him.
Leo continued sucking and bobbing his head up and down. He could feel his master's cock becoming more stiff. He then pulled his head back, revealing that his master's cock had now become all slick from the blowjob. 
Leo lay on his back and held his legs in the air. 'Sensei,' he purred, gazing seductively at his master.
'Yes, my son?'
'Put it in.'
'Pardon?' Splinter wasn't sure what Leo meant.
'I want you to enter me, sensei.'
Splinter was taken aback by this. 'Are you sure, Leonardo?'
Without hesitation, Leo answered, 'Yes.'
Splinter leant forward and eased himself in. Leo's cheeks reddened. Once he fully in, Splinter asked, 'Are you okay, my son?'
'Yes, sensei,' he said. 'I've been waiting for this for a while.'
'I hope that I will not disappoint.'
Splinter began thrusting slowly, moving back and forth, back and forth. He hoped that he wasn't causing his son much discomfort. He eventually stopped and remarked, 'I am impressed, my son.' 
'Thank you, sensei. I've been practicing.
'Really?' he said with a broad smile. 'Well then, let us get a bit more advanced.'
Splinter started thrusting faster and Leo was starting to lose control of himself. 'Ooh, sensei,' he cried. 'Faster! Faster!'
'Certainly, my son,' Splinter said.
He leant down and kissed Leo while he started thrusting faster. He could feel it, he was about to cum, and Leo felt he that was going to cum too. 'I'm nearly there, master,' Leo said. 
'Me too, Leonardo.'
'Then, let's do it together.'
Splinter didn't say anything. He picked Leo up and gritted his teeth as he felt himself shoot his load into Leo. And Leo cried out and arched his back as his seed shot out like a bullet from a gun onto Splinter's chest. They were both panting.
'That was excellent, Leonardo,' Splinter lauded.
'Thank you, sensei. Phew!'
'Would you like to stay with me for a while?'
'May I?' Leo sounded very happy to hear that.
'Of course you may, my son.' 
They both sat there for a while, holding each other tightly.

THE END