My brother is good looking but I had never thought about having sex with him. However one time, when Alex was visiting Lucy and I for the weekend, I came home on the Saturday morning, and found her (we had an open relationship) having sex with him. I was annoyed at Lucy for fucking my brother. I was going to storm out and did not want to be around a family member (literally ...lol) when they are fucking.
Lucy caught me at the doorway and said, "Laura, don't leave. I mean, you can't storm off angry. You love watching me have sex. Please stay."
I asked Alex, "how do you feel about your sister watching you?"
Alex replied, "Since you have now seen me totally naked with an erection, you may as well stay and watch. Not too close."
He indicated the dressing chair in the corner.
I hesitated, before realising the chair was in a dark corner of the room, and I could watch them without them really noticing me. The light above the bed was on fully making the bed almost floodlit. After a while I started to get seriously aroused.
I said to Lucy, "What a horny sight, seeing that nice cock pumping into you!"
Alex sniggered, and pointed out, "Should you be commenting on 'your brothers manhood'?"
They continued for some time, with Lucy shouting, "Fuck me....fuck me hard....mmmm harder."
Alex slowed for a bit and Lucy turned to me and said, "How aroused are you, Laura?"
Without thinking in my aroused state, I said, "I am so wet and my panties are soaked."
Alex withdrew from Lucy's pussy, turned to me, his hand massaging his glistening cock, and winked at me. I blushed, realising I had told Alex that I was aroused by watching him.
Alex repeated Lucy question, "Are you REALLY aroused?"
Feeling daring, I said something like "I am very wet from watching your lovely prick fuck my girlfriend!"
Lucy told me it was about time I undressed. I hesitated and Lucy asked Alex, "Would you like to see your sister naked and aroused?"
"Oh god yes........please."
I was turned on by Alex wanting me to undress, and I thought there is no harm in us being naked, we have seen each other naked before, especially given the darkness of the corner of the room.
A few times since puberty we have accidentally walked in on the other dressing or undressing. I once walked into the family shower room and caught him rubbing his erection....At the time I said sorry and left.....we were both really embarrassed.
I slipped off my pop socks. Then I unbuttoned my blouse, and as I pulled it over my shoulder, I could see Alex staring at my bra, licking his lips.
I unbuttoned my Jeans and stood to remove them, dropping my blouse on the floor.
As I stepped forward out of the Jeans, Alex said, "Pretty in pink!" commenting on the Pink Lepel Fiori set I have chosen that morning.
Still standing, I reached behind my back and unclipped the bra and slipped the straps off my shoulders. Without thinking I had moved much closer to the bed, away from the dark corner.
Alex said, "What fabulous titties you have!".
This made me blush, I was slightly annoyed by the expression and now regretted undressing, standing topless, in a pair of semi sheer lacy briefs. I shivered, though it was not at all cold in the room.
"Are you cold?" Alex asked, "Your nipples are so erect!"
Lucy interjected, "Her nipples get hard when she is really turned on. Come on Laura, much as Alex likes your pink panties, he wants to see your pussy!"
I was now much closer to the bed and could smell the aroma of sex. I considered running from the room and started to back off.
However, Alex had resumed stroking his cock, and Lucy was fondling his balls and licking his chest. I wanted to see more. I retreated to the reassuring darkness of the chair. I pulled my legs up onto the chair, and carefully removed my lacy briefs. Now in the gloom, with my legs up, no one could see anything.
Lucy said, "Oh no you don't, Alex wants to see you properly. Come on."
Thinking I had gone this far, and that the corner is dark anyway, I slipped my legs off the chair and opened my legs slightly.
Alex remarked, "I can tell she is not shaved like you, Lucy. But it is too dark to see anything else."
Lucy whispered something in Alex's ear. He nodded.
Lucy jumped off the bed and came over and stood naked in front of me, blocking Alex from seeing me. She said, "Give me a hug, to reassure me you are happy to be here, naked in this room."
I stood and embraced her. We kissed, our tongues intertwining. Her hands fondling my bottom. I started to rub my leg up against her leg and my hands carressed her back. My brother's presence was totally forgotton, as Lucy's hand started to assault my pussy. A finger slipped in to my vagina, making me groan loudly.