You are... surprised.

"What the fuck - why are you -" I am naked. And in Frank's lap? And insanely fucking hot? Fuck, you just got way too hard.

"Did you miss me, big brother?" I smile at you, standing up, Frank's cock popping out from under me as I turn my naked body to you.

"I missed you..." I say, biting my lip, running one hand under my breast, pulling it up, pinching my nope, letting it bounce down, the other hand running down between my thighs pressing generously into my pussy, pulling a stringy dribble of juices back out.

"I've been thinking about you. Every. Single. Night." I come up beside you and lift my juicy fingers to my lips, licking them hungrily clean before leaning over you and pressing those lips to yours, my hand running across your hard cock. You can taste my pussy in the kiss.

You stand quickly, pulling off your shirt, dropping it in the chair and I get this giddy grin in my eyes, nearly giggling with glee as you step over to me. You wrap an arm behind me, and I pull your your shorts and boxers hastily down before jumping on you, wrapping my legs around your waist, my tongue shoving as hard into your mouth as my breasts are pressing against your bare chest.

You reach under me, your fingers finding my wet pussy spread beneath me, just waiting for your cock. You slide me down onto it and I gasp, hips already grinding at you.

"I'll, uh, just be going, then..." Frank says behind us.

"See ya..." You respond, and I look up at you with that same giddy glee, nearly drooling in pleasure, shaking my head even as I bounce on your cock. You have no idea what I'm thinking.

"No..." I pull away, legs still wrapped around you, hips still driving your cock in and out of me. "Join us." I look back at you. "Spread my ass cheeks." I grin. You suddenly get the feeling this won't be the first cock in my ass.

"Do this often, sis?" You grin, spreading my cheeks faithfully as Frank comes up behind me.

"Never at the same time..." I bite my lip, looking nervously up at you. You see me wince, my hips slowing they're pace, and realize Frank's cock is pushing it's way inside me. "Oh God..." I whimper.

"Hey, Frank, that's enough." You say, and I shake my head.

"No, it's... Mmngh... It's good... Deeper... All the way... Both of you..." My naked body writhes in mid air, held aloft in your arms, my hips grinding on your cock, my eyes tight as my breath comes in gasps. You feel my pussy tighten on your cock, and wonder if I'm coming.

Fuck, you're about to. "Sis, I'm..." You start, but I kiss you. You feel Frank's hands reach around, squeezing my bare tits, my tongue fighting with yours in fits and starts as my body jerks gently between you.

I pull away from the kiss, whispering in your ear: "Cum inside me, big brother." And you do, right then, my breath turning into a noisy mix of gasps and cries as my naked body jerks between the two of you with each burst of your cum inside me. Seconds later, Frank utters a soft fuck, my body jolting, and you figure he's cumming in my ass.

"Nnngh..." I murmur, my voice an intense mixture of pain and pleasure as I lay my head on your shoulder. "Welcome home, big brother..."