Katia jerked me off

As my cock started twitching, Katia reached down and grabbed my cock.

"Wait, what-??!"

But it was too late. Her hand was firm and strong, and she stroked my dick expertly, as if she knew my cock better than me. I also felt familiar, as if I had already had her fingers around my cock. At the same time, screams of pleasure came from the bedroom. Probably the girls in the video had cum at the same time we did. Or was it Sarah and Brenda screaming?

I climaxed, and I shot all my load on her hand. I mean, it was a couple of small shots, but they coated a part of the back of her hand and a couple of her fingers. Katia squeezed my cock, not like a whore following orders, but like a master dictating me when and how to cum. I had the feeling my load would stop on its tracks had Katia decided to. I looked down and I saw her giving her own cock long, hard strokes as she also ejaculated. It was a magnificent sight: her dick twitched really hard, and as she jerked it, she let out long, thick ropes of semen, which fell on my floor and coffee table. There was so much of it!

"Oh, dude... You cum so little..." She groaned and chuckled as she let go of my cock and looked at her hand, stained with my jizz. "That was good, though, goon buddy. You can clean my mess." She licked my cum off her hand, like a hunter examining her prey. "Not bad."

After the immense pleasure waned, immense guilt flooded my mind.

"Oh, no... This... This was wrong! This was a mistake!"

"What? Nah, it's all cool."

"It's not cool!" I quickly pulled my shorts up and stood, starting to pace around the living room. "You... You jerked me off! I've cheated on my girlfriend! Ah, Sarah's gonna be so disappointed!"

"What's the bug deal, dude? I finished you off with my hand, so what? We're just having fun. Sarah jerks us off all the time!"

I stopped.

"What?"

Katia grimace, like thinking «I shouldn't have said that» way. She stood up and stretched, her huge cock still leaking some cum strings

"Alright. Liam, sorry, but it is what it is. Sarah loves you a whole lot, but she also loves having fun with her cousins. It's just a cousin thing."

I tilted my head. I wanted to believe it, as the twins had been so nice, and Sarah was so happy with them. But imagining my girlfriend giving incestuous futa handjobs was... So hot. No, so weird!

"Alright." I said after a long while. "It's starting to be a bit too much. At least you aren't fucking her..."

Katia shrugged and bobbed her head a little, doing a «so-so» gesture with her hands.

"Well..."

"Oh, no..."