Quickly

You climb off the bed and kneel beside her, grabbing her thick shaft with one hand while pushing up her t-shirt with the other, exposing nipples as erect as her cock. You start pumping her rod slowly while teasing the tip, allowing the ample amount of precum to coat your hand. At the same time, you were teasing her breasts, alternating between brushing your thumb over her nipple and rolling it between your thumb and forefinger. You watched as Gwen tried to fight to keep the abject pleasure from her face.

"Hnng.. f-fuck... wait..." she moaned

"Why, doesn't it feel good?" you whisper in her ear, with a playful nibble

"Yesss...." she obediently answers "B-but I don't want to cummm like thiiis~"

"Too bad." you say sternly. "I'm the one controlling your cock, now cum for me, big sis.."

You watch as Gwen hips thrust upwards and stiffen, twitching slightly as her cock shoots rope after rope of potent semen across her body. With her still being tied up, she can only watch as her own cock paints her body, with streaks of white across her tummy, breasts, and even across her lips. You watch her red, panting, cum-covered face in awe Is that how I look like when I cum?

"Happy...?" she half-moans to you, snapping you back to reality. Gwen's orgasm was more intense than you anticipated, and you noticed tiny spots of cum across your clothes. The tiniest drop could spell disaster so obviously they had to go. You stripped down to your birthday suit before realising your hand was still covered. Gwen watches as you give it a tentative lick, then another, then another.

I mean.. I don't want to contaminate any clothes or surfaces you weakly justify as you lap up the rest of her batter before looking to Gwen's cum-covered form.

W-well, I obviously can't let her go... it's to avoid contamination... definitely not for the taste...

You kneel down and slowly lick the cum off her body, starting at her now deflated shaft. You tried to ignore how incredible the slightly sweet/salty taste was as you quickly lapped up the remaining drops before it came back to life.

"Hnngg... ffuckkk this is soo unfairrr~" Gwen complained as she was **** to endure you "cleaning her up". She wriggled ticklishly when your tongue dipped into her navel and arched her back when reached her nipples. Eventually you reached her face, licking her cheeks and nose before finally giving her a taste. You kiss Gwen deeply as you feel her now clean shaft throbbing with renewed vigour against your sex. You break the kiss, leaving a thin line of drool as you sit upright in cowgirl position and rock your hips, gliding back and forth against her shaft and were rewarded with a sudden climax. Apparently this counted as Gwen "giving" you an orgasm. It felt incredible, but you felt your cunt clench hungrily for something more.

"Sis..." Gwen whispers

"Hm?"

"I have to pee..."