I am Succubus!

After having dinner with Hatsumi, I head back upstairs to my bedroom without ever finding out where the towel went. There is an inkling in my mind exactly where it is, but I'd rather not think about it.

When I reach for the door, I'm reminded of what Mio said before I went down for dinner. It sounded like she wanted to have sex with me. The thought makes me shudder with anxiousness and excitement.

It's not like I can avoid my bedroom. I have to go inside eventually, and seeing Mio on a daily basis is something I'll need to get used to from now on.

I swallow the lump in my throat, grab the knob, and open the door. But the catharsis of those mixed feelings won't be coming.

"Of course…" I say with a mixture of disappointment and relief.

Mio is passed out on the bed, snoring and clutching a half-finished manga. I make sure to close the door behind me as I walk in and slink into the room trying not to wake her.

"Why do I have to be quiet in my own room?"

I pluck the manga from her hands, put a bookmark on the page she left off, and stuff it back into the shelf. It was still early in the evening. There's no homework to do other than the handouts—

"Right… I forgot about the handouts. Guess I'll just find Kana and Shirai tomorrow before class."

An unbearable sensation starts knocking on my lower body, different from the orgasms I had. This is more like…

"I need to pee!"

I open the door a crack to make sure the coast is clear. It sounds like Hatsumi's in her room, and her door is closed. I quickly slip into the bathroom and stare at the toilet in utter confusion. What I would normally do standing up no longer applies as a girl. Or does it? 

"So how do I…"

Whichever way I position myself feels weird. Standing in front of the toilet seems like it's going to leak down my legs. Standing over it doesn't seem right either. That's going to splash all over the place.

"I sit down, right?"

I plant my butt on the toilet seat as the urge to let loose takes over, and the piss comes flooding out. Relief and shame washes over me as I have now experienced both sides of urinating.

"Great. I can't hold it in as a girl. When I need to go, I gotta go."

I sit on the toilet a little while longer to lament my condition. I've spent the first 18 years of my life as a boy, and I am not going to spend the rest of it as a girl. 

"You hear that?!" I scream at the toilet. "The next time I piss in here, it's going to be standing up! And with a dick in my hand!"

Once I finish my business, I head back to my room to find Mio missing. I check under the bed. Missing. The closet. Missing.

"Damn it, Mio! I said to stay in the room!"

I run down the hall praying that she hasn't gone downstairs to look for the curry. If Hatsumi finds out about Mio—

My heart stops when I see that Hatsumi's door is open, and the lights are on. From the other side, I hear talking. One of the voices is clearly my sister.

A sense of dread and deja vu fills me. It's like walking in on the Principal and Nurse all over again. 

"S-Sis?" I call out as I push the door open.

I'm surprised to see both Mio and Hatsumi sitting on the bed talking and laughing like they are the best of friends. Hatsumi sees me and waves.

"Saeko! Why didn't you tell me our cousin is in town?" My sis says.

"Cousin…?

Mio winks at me and puts a finger to her lips. "Well, I just wanted to surprise you two is all."

"Uhhhh?!" I am beyond confused. First of all, does Hatsumi not see the horns and wings? Or tail? Or… I don't know, THE SKIMPY CLOTHES?!

Hatsumi gets up from the bed and pulls me over to them. "Mio was just telling me how her adult cosplay convention concluded today and wanted to see how we were doing! It's so good to see her again.

Upon closer inspection, Hatsumi's eyes are glazed over in a similar fashion to the Principal and Nurse. 

Mio definitely charmed her.

"Sis… can I have a word with Mio…?" I say, trying to contain my anger.

"We'll catch up more later, Mio!" Hatsumi waves goodbye as I drag Mio out of the room and back into mine.

As soon as I shut the door. "WHAT ARE YOU THINKING?!"

Mio sticks a pinky into her ear. "I thought it'd be more convenient if your sister knew I was here."

"So you charmed her??"

"It's not exactly a charm, more of a suggestion. All I did was suggest to her that I was a cousin, and that I was visiting town and needed a place to stay."

I facepalm. "So you didn't have sex with her?"

"Do you want me to?"

"NO!"

Mio backs away. "Damn. You claimed your sister, too?"

"I DIDN'T CLAIM ANYONE!"

"Geez, stop yelling. By the way, I got your towel back." She hands me the towel I was using this morning.

"Wait, where did you find this?"

"I followed the scent. It was in your sister's room."

"What." I say, utterly perplexed. "Why was she holding onto it when she could've just given it back to me?"

"I dunno. But, dude. She's totally dripping with lust for you." Mio says as a matter of fact.

"— ?!" Suddenly, the world freezes on me. Mio's words replay in my mind over and over. "Yeah. I'll just pretend I didn't hear that, and go about the rest of my life this way."

"Kahahaha! You're a real riot!" Mio bursts out laughing.

"This isn't funny! But it makes sense… why she keeps babying me…"

"In my world, it's normal to fuck our sisters."

"I'M NOT FUCKING MY SISTER!"

I have to catch my breath with all this yelling. I feel like I'm going to faint.

"Alright, how about this?" Mio snaps her fingers.

"This— whaaaaat?!"

I'm thrown onto the bed. Just like in my dreams, invisible chains pull my limbs taut. No matter how much I struggle, I can't break free from them.

Mio climbs on top of me and licks her lips. She pushes my sweater up to my chest and pulls my towel off. Then she drops down to my legs to pull the rest of my clothes away. 

"W-w-what are you doing?"

"We're family now, and you're stressing out. It's only natural I help you relieve some of that stress." She bites down on her lips and purrs. "Nyahaha. It's time to break you in Mio style."

She cracks her neck and tears her own clothes off. The two of us are naked now, and she leans in to lick my nipples.

"Guh… stop, Mio! My sister's in the other room…"

"I made sure to put a delayed sleep spell on her. She's snoozing away and won't hear the sound of you getting fucked."

Mio puts her hands together. When she parts them, a purple and black whip appears between her palms. She takes a hold of it and whips her own butt.

"Nnnh♡! I miss this feeling. You'll start loving it, too."