She had to stretch her mouth wide and focus on breathing because she was not used to sucking off someone so large. She shuddered, thinking about how g...od that thick cock felt inside her. It was tempting to climb up and mount him again, but she kept her mind on the task at hand. She kept going until her nose was buried against his crotch and then she really worked him with her hungry mouth, sucking hard until she had to come up for air."Damn, kiddo, you are so good at that. Your mouth feels so. "Amanda wants to watch." I was stunned. As I just shook my head, I announced I was going to the store (I wasn't really expecting this to happen) to get a box of condoms, and I'd be back."We'll be here," Jessica said with a smile.I was gone about a half hour. And in returning, I half expected this to simply not happen. I hadn't really gotten my hopes up. After all, this was my sixteen year old step-daughter. This was her best friend, an amazingly cute and petite young girl. And I was horny as. Like I'm crumbling.I pull back, breaking free of her and I back away, my hands up defensively. My breath is uneven, and I feel this turmoil in me. Because I want to kiss her again."Why? Why can't you... tell me?"She sighs, crossing to her bed and sitting on it, drawing her legs up under her. I sit gingerly on the edge of the bed. I can't be too close to her."You're my best friend Sam."I snort. "Am I?"She looks up, her eyes wide. And she looks scared. "Yes. You are." She says the words slowly. I finished cleaning the house with my mom. Sitting in the kitchen, I watched my brother cutting the grass in the backyard. Shaking my head, I decided that even Kyle couldn't be that perverted. After all, I was his sister!By Monday I was beginning to worry. My brother seemed to be very secretive when he talked on the phone. If I walked into the room, Kyle whispered to whomever he was talking to. Without making it obvious, I finished in the kitchen and went out so I could listen to his.