I didn't see Ed on the night that we performed for him. I deliberately left the house early the following day, without wishing him a happy birthday, claiming to my mother that I needed to get to class early and that I was sure that Ed would rather sleep in if he wasn't already up.
I couldn't avoid Diane all day though and at lunch time, sat down with her. Of course we then had to discuss the events of the previous afternoon.
"Holy crap Nikki, I can't believe that you took your panties off in front of your own brother!"
"It was a spur of the moment thing. I was so fucking horny just thinking about us performing and saw that you didn't have pants on and thought 'hey why not?'"
"Well it sure worked, Ed went off like a fucking rocket last night, he's never fucked me that hard before. And did you see the look on his face when you kissed me? I thought that he was going to cum before I even got a chance to touch him."
"I thought it would be a nice touch."
"Nice? It was almost all that he could talk about after we fucked. He kept probing to ask if we'd ever kissed or anything before."
"What did you tell him?"
"Eventually I admitted that we had kissed, but told him that was as far as it went."
"And was he ok with that? His girlfriend kissing his sister?"
Diane laughed. "He thought it was hot, it didn't even seem to matter that you're his sister, he said at least I wasn't kissing someone he didn't know. Weird I tell you, weird!"
I laughed and blushed as I considered just how intimately my brother now knew me.
"He did ask one thing though ..." Diane said.
"Oh?"
"Um, he asked if I would be prepared to let him watch us kiss properly."
"And what did you say to that Di?"
"I said that if he was brave enough to ask his sister to kiss his girlfriend in front of him, then he could watch all he wants, because I doubt he'd have the balls to ask you that!" I laughed again, seeing something coming that Diane obviously wasn't expecting.
We had class then and didn't get to discuss it anymore. We both had to run straight home from uni in order to be home for Ed's birthday dinner, Di having been invited as well (she was his girlfriend after all).
Dinner was hilarious. Di kept making references to aerobics routines and school uniforms. She did it so well that Mum and Dad had no idea what was going on, but Ed kept nearly choking on his food. I blushed repeatedly but I think Ed's choking distracted my parents from noticing anything.
After dinner, the three of us went up to Ed's bedroom to listen to some music. Di sat nice and close to Ed and kept kissing him and teasing him, obviously with the intent of giving him an erection. She was, of course, successful. I just teased him by staring at it and making head job motions with my hand when Di wasn't looking.
"So what did Nikki get you for your birthday?" Diane asked him at one point.
"Nothing!" Ed exclaimed, feigning mortification. "But that's ok, because I have something I want to ask her to give me," he added, a cheeky grin on his face.
"Oh, and here I was about to get the present that I bought you, but that's ok, because I can always keep it," I teased.
"Hmm, well let me give you the choice, you can give me what I ask for and keep it, or give me what you bought."
"Sure," I said, a sneaking suspicion creeping into my mind.
"I want you to kiss Diane while I watch," he said bluntly. Diane choked on her soda and I laughed at her.
"That's a big ask," was all I said.
"What do you say Di, is your boyfriend worthy?" I asked her.
"You mean you'd do it?" Diane asked me, the shock on her face slowly morphing to a grin of excitement.
"Sure, I love kissing you," I said to her. Ed was sitting all but speechless on his bed. Diane stood up and held out her hands to me, pulling me from the chair by Ed's desk so that I was standing before her. We placed our hands on each other's waists and then brought our tongues together to kiss. Ed was freaking out, offering verbal assurance that he was immensely turned on by what we were doing.
I was horny as hell now. Kissing Diane at the best of times lit a fire inside me, doing it in front of my brother was amazing. I ran a hand up Diane's back and tangled it in her red hair. I felt her hands slip down to my butt, squeezing.
Ed was standing next to us now, close. He told us that the sight of our tongues in each other's mouths was so hot that he was surprised he didn't just cum in his pants. I moved my hand up Diane's side and then pushed her away just enough to get her huge tit in my hand.
"Don't stop," Ed said to us and moved in behind Diane. Then his hands were on her waist and he was pushing himself against her. I could feel her pelvis thrust towards me as he ground his hard cock against her butt. I let the hand that I had in Diane's hair slip back to her hip to pull myself against her as Ed did the same, crushing her between us. Diane tipped her head to one side and Ed pulled her hair out of the way and licked and kissed at her neck. I did the same to the other side of her neck and Diane moaned loudly.
"Want to see the most amazing thing ever Ed?" she asked him.
"And what on earth could be more amazing than this?" Ed asked.
"Well, I've seen your sister cum and I think that that is the most amazing thing ever ... especially if she's cumming because I've licked her pussy!"
"Oh fuck, I knew it!" Ed exclaimed. "I knew you were lying when you told me the only thing you'd done was kiss."
"What do you say Nikki, are you prepared to let your brother watch me lick you until you cum?" I was so horny by this stage that I was ready for just about anything and I briefly wondered at what point I'd actually say stop!
"Oh god, I guess so, yes, you can make me cum Di," I replied, feeling my face blush with guilt as Ed started capering about the room like he'd won the lottery. Diane was dragging me to his bed and pushing me back onto it. Then she reached up under my skirt and pulled my panties off. Ed sat down on the bed next to me and told me what a lovely pussy I had, pretending it was the first time that he'd seen it.
Diane knelt down on the floor and then began working her tongue up my leg, starting with my calves and then slowly, slowly licking and kissing higher and higher. By the time that she made my inner thighs there was a wet trail from my pussy to my anus and Ed was busy stroking his cock through his pants, obviously thinking that I wouldn't look.
Diane ran her tongue through my juices and Ed whimpered at the sight. He pulled Diane's hair out of the way so that he could see her tongue as it worked small circles around my clitoris.
"Get your cock out Ed, I want to see you wank it while I lick her," Diane said. Ed looked at me like he was checking if it was ok. I just smiled and he slipped his pants down to expose his rock hard cock. He started working his hand up and down its length.
"Such a nice cock hey Nik?" Di said between licks of my pussy.
"Mhmm," I replied, concentrating on the wonderful sensations between my legs. I was getting close and a couple of minutes later could feel an eruption building deep inside me.
"Does this turn you on Di?" I said and reached across and took Ed's cock in my hand and started pumping it up and down. Di stopped licking me and just stared. She watched my hand moving up and down, listening to Ed groan.
"Of fuck, that is so hot! I can't believe you're doing it to your brother!" and she dove back to my pussy, eyes cast up over my mound to watch my hand moving up and down as she plunged her tongue within me and then assaulted my clit.
"Fuck, I'm gonna cum!" I announced. Diane reacted by dragging her top off over her head before returning to my clit. The break delayed my orgasm a little, but not for long. I came in a torrent, fluid spraying out. Diane thrust her chest forward, lifting her face away from my cum, letting it soak into her bra and cleavage.
"Fucking hell!" Ed said as my legs and lower body shook and convulsed uncontrollably with my orgasm.
"I told you it was amazing!" Di giggled. Then she moved quickly to where Ed sat and plunged her mouth down over his cock. I watched as she worked her lips and tongue up and down him. Ed watched too, but also peered down at me. Diane wasn't wasting any time though and soon Ed announced that he too was going to explode.
Diane sucked him a couple more times then grabbed his cock with her fist and pumped it, her head held high as cum spurted from his cock so that it splashed against her neck. Then it ran down her chest to mingle with my cum.
Di licked and sucked Ed clean and then used her hands to rub his cum into her skin with mine. I just watched in amazement as her hands slid over her massive breasts.
"Holy crap, that's got to be the best birthday present anyone has ever given me!" Ed said, sitting on his bed, his cock semi-flaccid after his efforts.
"But Di hasn't cum yet" I said, blushing as they both turned to me.
"Who's going to make me?" Di asked, a grin on her face as she looked from me to Ed and back again.
"I want to see you do it to her Nikki," Ed said. "I want to see you eat pussy."
"Lucky its your birthday then, isn't it," I said, "And that I love doing it!" Diane lay herself down on Ed's bed and I moved so that I could lay between her legs, my tongue poised above her swollen lips. I parted them with my fingers and gently ran my tongue across them and then up and down and all over, Ed watching eagerly. Di squirmed and stifled a moan as my tongue made contact with her clitoris and began circling around and around and then asked Ed to put his cock in her mouth.
