That's hot...

As her orgasm subsides Emma sighs, looking down at her sister. Hannah looks so innocent lying there.

"After I **** her..." Emma's cock twitches.
"..stripped her..." It returns to full mast.
"Fucked her little tits..." She unconsciously returns to stroking herself.
"and painted her with my hot. Thick. Spunk!" She has become so hard it hurts, her breath catches in her chest and her heart flutters with how filthy she's made her little sister. Her last orgasm has barely finished and her hard strokes are milking the remnants from her dick. Her conscience barely registers and a sadistic thrill shudders through her as she oozes thick paste between her sisters parted lips.

Hannah lets out a soft moan as the powerful taste registers with her addled brain. Emma freezes in fear but to her immense shock Hannah gives her sisters cock a wet kiss before swallowing with a loud gulp and turning over in her sleep with a sigh. Emma almost cums again right then and there. Her limbs, already shaky, give out completely and she flops down against her sisters side.

That was the single most erotic thing she had ever seen or felt, "her lips were so soft...and she swallowed all of it..." Maybe little sis wasn't so innocent after all. As she processes what just happened her libido begins to reassert itself and her dick THWAK's against her stomach. Its feverish heat is so distracting that she almost misses Hannah mumbling in her sleep.