It had been quite a summer for me, all things considered. I'd made a habit of banging my sort-of sister, Vicky. While I'd fucked my fair share of girls in high school and college, I found myself feeling as though I was exploring new territory with her.
I was walking up to my room, when I heard sounds coming from the door next to mine. Remembering that this was the mysterious Bella's room, I decided to poke my head in and say hello. I opened the door and was shocked at what I'd found. There was a sexy brunette who looked NOTHING like Vicky naked on her back, going to town on herself with a vibrator. Where Vicky had a petite frame and a flat chest, Bella was a bit meaty with enormous, natural tits. Having seen a lot of porn I knew fake tits when I saw them, and these were real. It might have been all of the fondling of Vicky's A-cups, but these things seemed even bigger as I gawked at them.
"Can I help you?" I froze as Bella stared at me in the doorway, her eyes glued to my growing crotch.
"I...uh...hi, I'm Jim..."
"Is there any reason you're watching me fuck myself silly with a vibrator, Jim?" Her calm demeanor was unnerving.
"I'm...your brother, I wanted to introduce myself." I found myself choking on each word as it came out, expecting her to break her cool tone and rip my head off.
"Well, if you're my brother then you probably shouldn't be watching me cum, should you?" I shook my head, embarrassed. "Then why are you still here??" Struggling to apologize, I closed the door and went back to my room.
I was red as a tomato, in many places. I pushed back my frustration as I closed my door and whipped out my cock. Vicky was going to be at work until that night, and having seen my beautiful kind-of sister's naked body about to climax, I was ready to do some cumming of my own. I haphazardly grabbed some tissues from my nightstand, and started pumping my dick up and down. I was so hard, having seen Bella's breasts heaving up and down as her orgasm built up. I wanted nothing more than to cum on her huge tits, shooting rope after rope of hot jizz onto her ample bosom as she moaned in delight. Suddenly I felt that familiar sensation building up, and punished the poor tissues with my pent-up orgasm.
"Well, someone has a lot of cum." I turned around to see Bella standing there, fully dressed. I'd assumed she'd come back to talk over what happened. God, I was such an idiot! Here she was, willing to put things behind us and discuss what happened, and she walks in on me treating my body like a playground. I felt like such a perv. I started mumbling, but she caught me off as she walked into my bedroom. "You watched me cum, and I feel like it was only fair if I watched you." Realizing that this is how things started with Vicky, I decided to turn around and show her my junk in all its glory. "Oh please, Jim..." she started with a scoff, "that doesn't impress me." I felt ashamed, figuring that she'd probably seen tons of meat bigger than my average-sized dick. "Why should it? I'm a lesbian."
Things suddenly felt even weirder. I was standing naked, in front of this sexy lesbian who I'd also seen naked...but she was also my sister. Well, sort of. "I thought you were visiting colleges or something?"
"Oh, I was...it's tough to find a college with enough girls that like to eat out, you know?" She sat on my bed and gestured for me to cover up, which I did. "I'm Bella, by the way...sorry about the awkward introduction." I sat down next to her and saw her eyes drift to the still-present bulge in my pants.
