So, Maryam and I were at the stop, getting ready to board the rail to downtown Sacramento, and she had her fingers down my pants for a moment. To be fair, I had my hand on her booty, so it was tit for tat, as it were. One would never know that we were brother and sister, albeit with benefits. Yeah, I regularly humped my sexy Arab sister, but wouldn't you? We had the same father, but different mothers. Dad impregnated her mother while still very much married to Mom. Yeah, you do the math. Mom had a series of boyfriends over the years, so she wasn't hurting, either.
"Oh, damn, I can't wait to get you home today, bro, and slip this inside me!" Maryam whispered hungrily in my ear, stroking me just right to make it obvious what "this" meant.
"I wonder if your boyfriends ever have any idea how often you let your brother fuck you," I whispered back to her, making her giggle.
"Does anyone know that you fuck both Mama and me? You can't resist Arab girls, can you? You love our olive skin!" Maryam teased me some more as we boarded the train at last.
"Well, as you said, I'm fond of Arab girls," I shrugged as Maryam licked her lips.
"It's cool. I often spread her thighs and buns after you've fucked her silly and tongue her to another orgasm. By the way, I love how her ass tastes when you've come inside her backdoor. Maybe I should invite her to join us and rim me, too," Maryam answered me huskily, her lust undeniable as she let me grope her under her skirt.
"She should. You're delicious!" I slapped my sister's butt and pinched her left cheek.
Right then, another hand wandered over to Maryam's tush and started caressing her buttocks. Instead of complaining, my sister lifted her skirt just enough to invite the owner to play with her plump bottom a little more. A second, roaming hand began pushing toward her twat, sliding her panties aside to toy with her clit and her folds. Far from resisting this, Maryam raised her skirt some more and slid her panties down her thighs to assist this new third party. The owner of those hands now overtly played with her pussy, much to her gratification.
"Oh, damn! Don't quit now ... please don't!" Maryam begged me, afraid that I'd suddenly leave her entirely in the hands of our new companion.
Rather than quitting, of course, I was just about to make things worse for Maryam by moving my hand up her blouse to free her breasts from her bra. This was when I realized that she wasn't wearing a bra in the least. Grinning, I lifted my sister's top all the way to her shoulders and she simply pulled it off, leaving herself completely topless. Our new partner was now joined by another person, who had his or her hands on her tits, fondling her with obvious pleasure in the act.
"I think that we have some company, sis," I said the obvious.