I increased my speed and force once I got more comfortable, and found a rhythm that made Celina cry out in pleasure.

“Ooh! Oh Mistress yes... Please....god yes...!”

I smiled, enjoying how powerful it made me feel, as i imagined the pleasure Celina must be feeling at that moment. I knew firsthand how good it felt to be on the receiving end of a good finger fucking. Mm, I could go for one of those right now. Growing in confidence, I went harder, faster, deeper then before and soon found myself totally on top of Celina using my elbow and shoulder for extra leverage.

“Ahh! Mistress, yes! Please! Fuck!” Celina shouted with her face wrinkled up in orgasmic pleasure.

“Ohh, yes that’s a good girl. Does that feel good?” I teased as I pinched Celina’s nipples with my free hand.

“F- Ah! Fuck! Yes!” Celina bucked her hips against my thrusts. She pulled at the ropes at her wrists, still helplessly bound and forced to accept my fingers as I saw fit.

“That face means she’s gonna cum soon,” Laurie said from over my shoulder. She’d been next to the bed, watching her girlfriend moan, gasp, and twist in pleasure. She was completely enthralled, loving every second of her girlfriend get finger fucked by their friend. She looked like she found it so hot to be cucked like that - did it even count as a cuck?

“See how she wrinkled her nose like that? Curve your fingers upward and go in as deep as you can,” Laurie instructed me, “and make sure you keep rubbing her clit with your thumb. You’ve got probably 30 seconds.”

Ha! I was really going to do this! I grinned wickedly, a deep and primal excitement at making my first female sub cum under my hand. It was so exhilarating, so fascinating! I could imagine exactly how it felt, my fingers slamming deep into her wet cunt until she started to quiver around me. I did as Laurie said, and watched as that adorable telltale nose wrinkle deepened until I felt Celina start to spasm.

“Ohhh...! Oh! Mmmmm!” Celina’s entire body convulsed as a new wave of pleasure rocked her from head to toe. She pulled against the ropes at her hands and feet, unable to get away from the overwhelming sensations between her legs.

“Ahh!! Ohhh mm-mistress-! Ahhnn!” Celina cried out before falling into an incomprehensible string of moans. Never stopping my ruthless motions, I pushed deeper and deeper into Celina's cunt, now clenching around my wet hand.

“Ohh, yesss, that's a good girl ....” I sighed in my secondhand pleasure. The rush I felt was indescribable - even more intense than when I made my male subs cum. I could almost feel the pleasure myself, picture exactly what Celina was feeling. How good it would feel to have that done to her...

I put my free hand on Celina's tit and squeezed her nipple as wave after wave of orgasm crashed through her body.

“Ohhh...” Celina moaned again, then gasped as if she had just remembered she needed to breathe. I slowed down as Celina panted and squirmed under my body. Sensing she was about finished, I slowed to a stop and took my sopping wet fingers from Celina's pussy and clit.

“Mmmmm...” Celina moaned again.

“Mm,” I returned the sound, licking my lips at how delicious her pleasure looked. I did it! I really did it! That was so fun! As much as I enjoyed making her cum so hard, I was almost jealous. I crawled onto Celina and kissed her neck, now covered in a sheen of sweat and stuck with her loose hair.

“Did you like that, you little slut?” I whispered into her ear before nibbling at her ear lobe.

“Ahh-! Yes mistress...” Celina moaned breathily. “Ohh that felt so good...” I giggled and nibbled her neck again.

“Good.... Now you just sit back and catch your breath, and enjoy the show,” I said with a wink.

“Sh-show?”

Without answering her, I asked Laurie to untie her as I set my sights to Dan.

To be continued