Katia

Katia's strong stance was unmistakable. She was wearing some tiny shorts and a short tank top that tightened against her breasts beautifully. She was holding a tablet under her arm.

"Huh?" I mumbled, barely conscious.

"'Sup, dude. Wanna have some fun?" She approached, and I sat up as she sat down next to me. "Sarah said it's cool."

"I... I'm still unsure. I don't know if I'd feel uncomfortable doing that with someone else..."

She passed an arm around me and chuckled.

"Nah, nah, don't worry. Look, she's doing the same with Brenda right now. No biggie, they're just having a great time. Why not you?"

The phrasing of that sounded weird, but I could hear sex sounds coming from the room: those two were definitely watching porn. Katia's face barely lit by her gadget's screen looked both ominous and sensual. She felt... Needy.

"We... We can try it out."

"Cool!" She said in a whisper. She pulled me closer to her. I could very easily feel her muscles, and her breasts pressing against me, which made me feel guilty. However, that sensation slowly faded as I remembered I had Sarah's «permission».

Once she was hugging me firmly, she showed me the video. There were two girls who, according to the plot, were stepsisters. One was short and blonde, the other one was a brunette, a very tall one. The brunette had the blonde pinned against a sofa. The blonde struggled, but couldn't escape her stepsister's grasp.

"She says «No», but she knows she's a slut for her sister..." Katia explains with a seductive whisper. "Hot, right?"

"Yes. It's... They're hot, yes."

"Oh, their boobs are pressing against the other!" She sighed as she pressed her own tits against me. I was so aroused, but also confused as to why Sarah would want that. "Come on, dude, start jerking."

"What??"

"What good is porn if you can't jerk off?" She whispered as she slid her hand into her shorts and started pressing her thick, muscular thighs together. "Just do it."

I was unsure, but after seeing her start and imagining Sarah and Brenda doing it as well, I did so myself. I pulled down my shorts and boxers and took out my 5-inch cock, which was half-hard at the moment. Katia smirked when she saw it, and I thought she'd mock me, but she instantly ground her thighs together even more.

"How... Cute." She giggled, but I could hear the desire in her voice.

I grabbed my cock and tried to focus more on the lesbians on the screen than on Katia's lustful eyes. The girls started undressing, and soon the blonde pulled the brunette's jeans down and revealed a big, bouncy cock.

"What? She's trans?"

"No, she's intersex. You see, some women are born with both a cock and a pussy. We're also called futanari."

"Oh, I see. Wait... We?"

"Alright, dude, don't freak out, ok?" Katia was holding my shoulders with her left arm, so she used her right hand to pull down her own shorts and reveal a big cock herself.

"WAIT, WHAT?"

"Shh! Take it easy." She whispered. "It's alright. Brenda is one too, and Sarah knows about us. I know you're cool enough to understand. We're still girls, you know? We just have a cock!

Katia was so chill, and her calm kept me from overreacting. I looked at her dick. It was much longer than mine. I didn't know how she could hide it all this time under her clothes. I looked up at her. I was even more confused. Sarah already knew? So right now, Brenda was fapping next to my girlfriend? And Sarah liked that? And she wanted Katia and I to... Fap together? I didn't know what was going on fully.

"Your cock is still very hard." Katia commented. "That means you like what you see, dude."

"What? I'm just... I'm not..."

"Nah, it's not gay. I'm still a girl. Am I not hot?" She chuckled. Her confidence almost made me forget she was holding a long, rock hard dick. "Being a futa doesn't change that. Just let's relax and watch some porn, alright?"

I decided to trust Sarah. And to trust Katia. And to trust the growing arousal I was feeling, ignoring the guilt in my heart.

"Yeah."

In the video, the blonde was sucking the brunette's cock so intensely. She licked its lenght, she sucked its head, she deepthroated it. The gulping noises they made were almost as loud as the moaning from the video Sarah was watching in the other room.

"How good is that?" Katia said with a sexy whisper.

"Honestly... it's really hot."

"Oh, I know."

I glanced at her. She was looking at me with so much lust in her eyes, and her gaze went from my face to my cock. She was as smirking. I looked at her cock, even bigger and harder now, basically twice as long as mine, with thick drops of presemen already glistening on its tip. Her hand was gripping really hard and stroking long.

I could not believe how horny I got. The blonde on the video had bent over, and the brunette was fucking her already. It was truly amazing to see a girl penetrating another. I didn't know I could be so much into it. I had to stop stroking at times because I was so close, while Katis kept on jerking off faster and hardwr. She seemed to have much more stamina than me.

I didn't know what was hotter: the video we were watching, Katia fapping, or the knowledge that my girlfriend was masturbating with her futanari cousin in the other room.

"Oh, dude, so close." Katia said after a while with an incredibly sexy voice. She was stroking her cock really hard, whole pressing her thick thighs together and imprisoning me with her strong arm. Her dick was already coated in her precum, and it'd started to twitch.

"Me too, Katia." It was almost painful how much I was resisting cumming.

"Oh, yeah! Let's cum together!"

I nodded. I stopped watching the video and focused on Katia. Her athletic body twitched a little to her frantic strokes, it was beautiful. I couldn't hold it any longer.

"Katia... I'm..."