Spying On Step-Sis's Sexy Slumber Party with Bff

Story - My step-sister Evelin Stone and her hot, tiny, blonde friend Anastasia Knight sat on the couch and something in me told me to stay and watch. They slowly peel each others clothes off, kissing all over. Evelin plays with her friend's pink nipples, and removes her panties. She opens her legs for my step-sister to lick, spreading her lips and begging to feel her wet tongue slide over her clit. . Step-sis makes her friend orgasm, sending her into full body spasms! and now it's Evelin's turn! I couldn't believe what I was seeing. . . my step-sister's ass arched, high in the air, grinding her cheeks on her friend's tongue until she cums! They look around, but don't see me spying on their little lesbian escapade. . .