Matarō has been missing his sister far more than he would ever be willing to admit to anyone, anywhere, for any reason. And not just because he missed her feet and had really started to enjoy things like having his ass fucked and getting a mouthful of cum. He loved his sister, and the fact that he hadn't been able to find her when he had promised their parents he would had been killing him.
It wasn't really his fault, one Cover with a human inside looked the same as the next and there were millions of them, but that didn't stop Matarō from blaming himself for not finding her.
So, needless to say, he nearly broke down crying when she was back. He tried to apologize to her for not finding her, but Mako wouldn't hear of it. "You risked your life going out there just to find me." Mako said with a smile, pulling him into a death grip hug that, for once, he simply welcomed. "Someone's earned some extra foot times~" Mako whispered to Matarō, almost instantly getting hard.
Mako giggled, heading to the room she and Matarō had to share, what with space being so tight. Not that they minded; Matarō would've asked to stay in her room anyway.
Matarō couldn't believe how sexy Mako looked in the Nudist Beach 'outfit', said with the biggest air quotes possible. To Mako's surprise though, Matarō didn't drop to his knees and start slobbering all over her feet the second the door was closed. Well, he did drop to his feet, but kept his head level with Mako's crotch, and leaved forward to lick her balls; making her shiver after having gone so long with no pleasure.
Mako could say as much as she wanted, but Matarō still felt guilty; and the only thing he could think to do was do everything he knew his big sis really wanted. And if there was one thing he knew, it was that his sis loved it when he specifically, possibly because he was the only 'he' she had ever had, did things with her cock.
Mako moaned as Matarō kept going, dragging his tongue across her balls slowly, the way he knew she loved. Matarō kept it up for several moments before taking her balls in his mouth and sucking on them; gently at first, then harder with his tongue trailing across them as Mako moaned more and more.
"D-dang M-Matarō~" Mako moaned, "You've gotten really good at this~"
Ordinarily, Matarō would've been embarrassed by the fact that he was in any way proficient in pleasuring someone like this, but now, hearing Mako say it made him happy with the knowledge that he ws pleasing his sister, and he kept going, sucking more and more until Mako came in his hair.
Unlike the previous times it had happened Matarō didn't even attempt to clean the cum out of his hair, knowing that Mako got horny when she saw it, and moved his head up a bit to lick at the top of Mako's cock before moving his head down and taking several inches in his mouth. Matarō bobbed his head along Mako's rod, but after several minutes was still unable to work his way to the hilt.
Mako didn't seem to mind, as he'd never been able to fit for than half her cock in his mouth at once and was now down to the two thirds point (not a chance in hell Matarō would admit to the several nights he'd spent practicing on large dildos to get the technique down just right for Mako), but that wasn't enough for Matarō. His sister deserved the best he could possibly give.
Matarō took Mako's hands, placing them on his head to tell her she could face-fuck him to push her cock deeper. "Are you sure?" Mako asked, biting her lip as she was already holding back the urge to do so. Matarō responded by tightening his lips around her rod and humming around it; giving Mako the okay.
Knowing that Matarō really wanted to do this, and unable to resist any longer, Mako gripped his head and began pushing it down hard as she thrust up into it. Matarō gagged around Mako's cock, but kept going, forcing it deeper until, to his delight, he finally reached the base.
None too soon either, as Mako only lasted a few more seconds before cumming hard; forcing every drop of her seed down Matarō's throat. He didn't mind, it actually felt strangely good as it went down, and he'd developed a bit of a taste for Mako's cum.
"Wow.." Mako panted as Matarō pulled hos head off her member, licking it to make sure it was all cleaned up, "That was great!" She grinned, holding up her foot, "Now how about I return the favor~?"
Matarō smiled, then frowned when he saw Mako's cock. Mako was still hard, which meant he wasn't done, and couldn't allow himself to stop and enjoy his sister's beautiful feet. Matarō finished undressing, and straddled Mako with a grin. "I think I've got another hole for you first~" Matarō said.
Mako smiled. She knew Matarō was fighting the urge to just grab her feet and cover them in cum until he couldn't any more, but she also knew that no amount of telling him that he could just enjoy himself would make Matarō feel better until he finished his little mission.
So Mako moaned at the feeling, lining up her saliva coated cock to Matarō's well trained, yet still pleasantly tight, asshole and pulling down on his hips.
Matarō didn't yelp in pain anymore, just moaned in pleasure immediately upon feeling his sister's massive cock penetrate him. He'd missed it so much while she was gone, and didn't care if anyone found out. More importantly though, Mako was moaning, which spurred Matarō to start bucking his hips, slowly at first, then faster, harder. He'd ride Mako until she couldn't cum a drop, be her cock sleeve all and night if that's how long it took for his ass to milk her of every drop.
And once Mako was in a blissful pleasure coma, then and only then when Matarō start licking her feet.