Spying on Step Sis's Sexy Slumber Party with BFF

My sibling's Evelin Stone and her attractive, petite, fair-haired companion Anastasia Knight were perched on the sofa and for some reason, I felt compelled to stay and observe. They gradually removed each other's garments, sharing kisses all over. Evelin teasingly fondled her acquaintance's rosy nipples and removed her underwear.
She spread her legs and offered herself for my sibling to pleasure, parting her folds and eagerly requesting the sensation of her moist tongue gliding over her sensitive spot. My sibling brought her companion to climax, causing her to convulse with ecstasy! And then it was Evelin's time to experience pleasure! I couldn't fathom what was unfolding before my eyes. my step-sibling's buttocks raised, elevated in the air, rubbing her cheeks against her friend's tongue until she reaches climax! They glanced around, unaware of my discreet observation of their intimate female encounter.