Reply: My bro's girlfriend

Recently, while my brother was serving 90 days in county jail I moved into he and his girlfriends apartment to keep her company. I didn't mind, I've always gotten along pretty well with Kim (I changed the name to protect her identity ).
While living together we became even closer friends than we had been and sat up talking all through the night. One of the things Kim confided in me was that she's bisexual, but has never been with a girl. She's always wanted to though.
Being bi myself, I couldn't resist teasing her and flirting a little. I've always thought Kim was hot. She's a short goth girl with pale skin, bright blue eyes and jet black hair. She's about average in looks and boob size, but her ass is an absolute work of art. Michelangelo couldn't sculpt one better. It's one of the reasons my brother hooked up with her, he was really into anal.
One morning during Kim's shower I walked into the bathroom and slid the shower door open. After an initial moment of surprise and embarrassment, she just smiled and we talked a little while she showered. She didn't seem surprised when I started to undress. But she did say "I don't feel right doing this... I'm your brother's girlfriend."
"He isn't here," I said. "And he did ask me to keep you company. Besides, your curious and I want to satisfy your curiosity."
I stepped into the shower next to Kim. I was a little taller than her (she was 5'' and I'm about 5'2'') and slenderer. I'm a light eyed brunette too, with boobs about the same size (my areolas and nipples are brown, whereas hers are more pink) and a smaller butt. The water was steaming, just the way I like it.
We kissed and began washing one another. When we were done, we dried each other off and walked out to the bed (it was a studio apartment and so the bed was literally right outside the bathroom door).
"You've got me really horny," Kim smiled. "My vah jay jay's all tingly."
"Lay down," I smiled back. "Let me eat your pussy."
She got on the bed and propped herself up on her elbows, spreading her short, thick legs and exposing her clean shaven pussy. Her ass was so round. I got between her thighs and began licking, sucking and fingering. She moaned and groaned and slid around, getting wetter and wetter. Her juices were soaking the mattress and running down the crack of her ass as I made her cum again and again.
"Your turn," I told her, laying down. She ate my pussy clumsily, but enthusiastically. I could tell she was enjoying herself. I ground my pussy against her mouth as she ate means then I squirted and she took it full in the face, closing her eyes and laughing.
"You didn't tell me you were a squirter."
"Sorry," I smiled.
I asked her if my brother fucked her in the ass. Everybody knew he had an ass fetish. He constantly talked about it.
"All the time," she replied. "Sometimes I think he prefers it to my pussy."
I smacked her ass and watched it jiggle. "I can see why he likes it. Hell, it's turning me on and I don't even have a dick."
"I'd be lying if I said I didn't miss him riding it," she said.
"Well," I smiled. "I don't have a dick... but I do have a brush with a nice long handle."
I went to my bag and pulled out a hairbrush with a long, smooth plastic handle. Kim tossed me a tube of astroglide and I lubed the brush and then her ass. She had gotten into a doggy style position for me. I slowly inserted the brush handle into her ass and then began sliding it in and out at a nice steady pace, while licking her pussy and sucking her clit. She began moaning again. I was anal fucking her with the brush in one hand, and fingering her pussy with the other. She came again.
I crawled on top of her and we kissed.
"I need to go home and get my 8-inch Doc Johnson's dildo," I said. "All my toys."
"Hell yeah you do," she smiled. "We've got another month and a half together."
And so later that day I did. And for the remaining days we spent together, we made love every day and she totally satisfied her lesbian curiosity. When my brother got released (two weeks early due to overcrowding - Kim and I were both happy and disappointed) I said goodbye and went home.