Kissing My Brother's Cock Is a Little Sister's Duty ♡

The sound of footsteps echoed through the halls of Eisenwald Fortress. Meanwhile, the two little sisters were sprinting down the corridor. Their eyes brimmed with tears, faces twisted like they might burst into sobs at any second, openly venting their helpless frustration.

"There's no way Big Brother could be dead… that can't happen…."

"I hate Dad. Everything he says is bullshit."

"Exactly. 'It's a royal decree, we can't refuse.' He's just completely whipped by that woman's sex appeal!"

"Who the hell is even expecting anything from a remote border family like ours? Idiots."

Every step they took was laced with irritation, their little kicks full of extra force. But with their tiny, adorable bodies, it was nothing more than cute, futile stomping. They had no real destination. They just kept circling round and round inside the mansion to burn off their anger. The sight of them spinning like squirrels in a wheel made every passing maid stare in fascination.

"What are we supposed to do now? Father seems to have made up his mind. No matter how much we beg, he won't listen."

"Let's kidnap Big Brother. We'll drug him again."

"That won't work. Father will probably expect that. And even if we did kidnap him, where would we even go?"

"Hiiing…."

There was no answer. If they let him leave like this, it would be at least three years. That was far too long to stay behind in the mansion and wait in lonely misery.

"He might end up defiling his womb with some other man's seed. I swore my first egg would go to Big Brother… how could this happen…."

"Muu. Marrying some uncle whose face I don't even know. I hate that."

The two of them kept circling the corridor, lost in memories of the old days. Even calling them "old days," every single memory was of their beloved older brother.

- The day Sabine and Line were born, their birth mother died.

- Her body had always been frail. Giving birth to twins had been an overwhelming burden.

- Gustav had been too busy with work. The one who had carried them on his back and raised them was none other than Ludo.

"He said just looking at our faces reminded him of our dead mother, so he never came near us. Whenever we asked him to play, he'd always say he had family duties and avoid us. But the second he needed something, he'd treat us like women."

"Yeah. I really hate him. He's the worst."

They said they hated him, but it wasn't like he treated them as mere breeding stock. After all, he'd spoiled them rotten enough to forgive their insolent behavior in his office earlier. Still, that didn't necessarily mean he loved them as daughters. A father who avoided contact because it reminded him of his wife and only provided the bare necessities was, in some ways, worse than not having one at all.

"And now he's acting all generous, saying he'll find us good families? He's just scared of what other people ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠will think!"

"Die. Dad should just die. I'll never forgive him."

Gustav might claim it was for his daughters' sake, but to the two of them, he was nothing but a coward terrified of others' opinions. They spent the whole day badmouthing their father until they finally arrived at one of their favorite spots in the entire mansion.

"We're back here again…."

"Hehe."

They checked the corridor several times to make sure no one was around, then reached for the doorknob. Of course, the door was locked. The two of them used their own Blessing and slipped inside through the shadows. It was exactly like when they'd snuck into the office earlier. Just as Ludo possessed a special Blessing, Sabine and Line had the ability to freely manipulate shadows.

'Can you see Big Brother?'

'Yeah. He's sleeping soundly. But he's not wearing any clothes.'

'Hiiit~!?'

They slowly poked their faces out from beneath the bed where someone else was lying. Sabine and Line's faces flushed bright red, their expressions screaming with obvious lust.

"Mmm… mmm…."

And they weren't seeing things. Ludo was stretched out with his legs straight, completely naked, sleeping peacefully. At first Sabine's heart had raced at the sight, but soon she and ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠Line both tilted their heads in confusion.

'That's weird. He only just got forced into that teaching position by that auntie a little while ago. It looked like he was worrying about all sorts of things until just now… so why is he already asleep?'

'I don't know. The room's a mess. That's not like Big Brother at all.'

The precious recommendation letter was even lying crumpled on the floor. It was obvious he'd been running around the room like a dog desperate to shit, clutching the letter he'd just received, before collapsing on the spot.

'He's always said he wanted to leave this tiny territory. There's no way Big Brother would treat a recommendation letter so carelessly….'

It wasn't that Ludo was lazy. Line soon discovered the reason.

'Sniff sniff. Here… there's a medicine smell around Big Brother's mouth.'

'Medicine? You mean… the stuff we made earlier?'

'Yeah.'

Looking again, they noticed a small dish right beside the bed. He'd probably eaten the leftover bread from lunch, even though it only had the jam their cute little sister had made, because it felt too wasteful to throw it away.

""~~~~!!""

The moment they realized he'd passed out again, the heat between their legs rose like steam from a freshly boiled kettle. It was a filthy, womanly smile they would never show their beloved brother.

'Sabine. Let's get pregnant. Then Dad can't do anything. Just jump him.'

'If it were up to me, I'd love to.'

'Then why aren't you?'

'There's no guarantee I'll get pregnant. If I fail and Father finds out my hymen is gone, it'll be a huge problem. He might even learn the truth about what we've done to Big Brother and we'll lose his favor.'

'Ugh. I don't want that….'

In the office they'd boldly argued about the medicine, but in truth they understood reality better than anyone. It was one thing for a little sister to genuinely adore her brother, but drugging him and raping him? Losing his favor would be the least of their worries. If he looked at them with disgust, it would tear both their bodies and hearts into a thousand pieces.

'Big Brother leaves tomorrow. The day after, he'll be gone from the family. And that will be the end.'

'I know. That's why I came up with one trick. Will you hear it?'

'Yeah, yeah.'

Sabine's tongue flicked like a snake. Whatever scheme she'd thought up, Line's normally expressionless face filled with shock. Whatever it was, it clearly wasn't a normal plan.

'Is that really okay? Dad will get angry.'

'If we stay home, we'll just have our chastity stolen. You don't want to call some greasy old man whose name you don't even know your husband, do you?'

'Ugh, yeah. I hate that. I absolutely hate it.'

'Then we have to do it. Father will search for us, but if Big Brother says he doesn't know anything, he won't be able to chase us. After all, he'd never dream that Ludo would cover for us.'

'Is Big Brother on Dad's side?'

'Exactly. That's the part we'll use.'

The shadows rippled. A single strand of shadow rose slowly from their toes, sharpened into a blade, and sliced the tip of their sleeping brother's finger.

"Ugh!"

His sleeping body twitched at the momentary pain. The two girls slipped back into the shadows, then poked out again when they realized he wasn't waking up.

'Phew.'

'Did you get it?'

'Yeah. I got a few drops.'

Sabine collected several drops of her brother's blood into a small glass vial. Careful not to let it touch her own body, she slipped it into the shadows. The tiny bottle vanished, and the two sisters grinned like children who'd just succeeded at a prank.

'With this, our preparations to run away are complete. Come on, let's get out before Big Brother wakes up.'

'Wait. Just a little longer.'

'What are you going to do?'

'Today is the last day. We won't be able to play with Big Brother for a while. So let's mess around before we go.'

'Eh, what kind of messing around?'

'Kisses.'

At their age, kisses? Sabine wondered if they really had to, but her face quickly turned red. Like the saying that a quiet cat climbs the stove first, the usually quietest of the two pressed her cheek against her brother's lower body without hesitation.

"Mmmuu…."

"Line!?"

She accidentally let out a sound. Fortunately their brother didn't wake, but it was an incredibly shocking sight. Those tiny lips were pressed right against his glans.

"Big Brother. Have a safe trip on your long journey. Chu, chu, chuuuup~♡"

She gently sucked on the side of his glans, leaving clear lip marks. She even touched the tip of her tongue to it, licking and licking~♡ enjoying it like she was licking ice cream…. From the wetness, it was obvious she was tasting him.

'What the hell are you doing~!?'

Sabine had shouted loudly at first, but then lowered her voice in case her brother woke and cried out again. Line answered brightly, as if nothing was strange at all.

'Big Brother is going on a long trip. Just in case, I'm offering my first kiss right now.'

'First kisses are supposed to be on the mouth!'

'I know. But he might meet other women. So I'm marking him before that happens.'

-Marking!

'Th-there was a move like that!'

Whatever she was impressed by, Sabine joined her sister and pressed her head against her brother's lower body too. He'd just come back from catching ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠thieves. It had a strong smell of sweat, but that only made it more interesting.

'Sniff sniff… it's thick and stinky. It should be a disgusting sweat smell, but knowing it's Big Brother's makes my instincts tingle for some reason.'

Normally she wouldn't lick sweat. But if it belonged to the person she loved, the story was different. Even knowing it was a perverted fetish, her tongue instinctively reached out.

"Big Brother. I don't know what mission it is, but please don't get hurt…."

"Please. Big Brother. Come back safely."

She first touched her tongue to the glans to taste it. Then, deciding it was fine, she pressed her lips to it and began sucking. Chuuup~♡ Chuuup~♡ The air trapped between her lips and his glans was sucked in, creating vulgar wet sounds that echoed around them with every suck.

'Mmm, ugh, salty and fishy… normally I'd avoid a taste like this, but….'

'Itsh sho good… thish ish weird… it's a taste you could get addicted to….'

The flavor thick with sweat and the deep scent of a man. Normally one would want to pull their tongue away, but they felt no such urge. It wasn't even fellatio, just kissing, but the mere act of putting their lips on his glans stirred up intense sexual desire. Even though their bodies were small, they were adults. This was proof that their instincts had awakened to the pleasure of a man's taste.

"Mmm, mmm, mmmuuu… chuuup~♡"

"Chuuuuuuu~♡ Chuuuu~♡"

In this room filled only with the sound of peaceful breathing, the obscene sounds of lips meeting glans spread endlessly. On the crown of his glans, the two cute little sisters pressed their lips, nibbling and leaving their marks with all their might. If Ludo had woken up and seen this scene, he might have fainted from shock and ejaculated at the same time.

"Ugh…."

""~~~~!?""

What came out was only precum. A thin, white, viscous fluid rose from his urethra. This time Sabine couldn't hold back her curiosity and stuck her tongue out first. Lick lick~♡

'Ah, it's a strange taste. But I like this too. Big Brother's cock is delicious.'

'If it were food I'd hate this taste. But because it's Big Brother's, I like it. I want to keep licking.'

Her mind went blank for a moment and her tongue stretched out. It was a situation that could have led to full fellatio, but she barely held back her desire and pressed her tongue to his urethra.

"Nngu, ung, beeeeh…."

"Beh, ebebe… bevet…."

Working together, they scooped up the precum with the tips of their tongues, sucked it all down, then pressed their lips to his glans again.

"Mmmoh, mmmuap, mumumut~!"

"Chup ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠chup, chuuuu~."

Kissing the tip of the glans required special care. It wasn't just once or twice. Sabine and Line took turns, kissing it over and over again.

""Chuuup~♡""

For the finale, the twins pressed their lips together in a cute double kiss. The faint moisture left clear kiss marks behind. The two of them gazed at their handiwork, satisfying their possessiveness.

'Hehe. The kiss marks are there.'

'I hope this becomes a talisman that protects Big Brother on his journey….'

In their hearts they wanted to do even more, but they didn't have the courage to be hated by their brother, so they held back. Instead, they carefully stored the collected blood in the shadows and hurriedly left the room.

Later, several hours passed. Ludo finally woke at dawn and realized his glans was wet and sticky.

"…Did I… jerk off in my sleep?"

Since he'd woken at dawn, he tried to go back to sleep, but even that didn't go as planned. It was the first time in his life he'd felt such desire. Needless to say, he tossed and turned all night, unable to sleep a wink.