Gwen fucks your ass

Gwen presses the tip of her cock through your now exhausted ring of muscle, working it back and forth, deeper with each thrust. Even after all Gwen's efforts her cock was still enough to stretch you to your limit. You feel her hips against your ass and you sigh in relief. She pulls all the way out almost to the tip, before thrusting back in again, faster each time.

"F-fuck... your ass is so tight..." She moans as she fucks you more and more earnestly. Apparently your body was also like Gwen's in that it recovers faster from sex. Just a few minutes of fucking was enough for your pussy to start quivering with renowned need. Soon every thrust was sending an echo of pleasure through your sex, but without any direct stimulation , it would never be enough to make you cum. By now, any pain or discomfort from Gwen's cock was gone, and all you could focus on was your growing need for release, and you do your best to let Gwen know despite the gag.

"Hah, you sound like a cat in heat, sis, do you wanna cum?"

You nod avidly. She pulls you up to your knees and turns you to face the mirror. You see your bound and gagged self in the reflection, your breasts rocking as Gwen bounced you up and down on her cock. A steady stream of arousal is leaking from your pussy, forming a continuous line to the bed.

"Remember this?" she asked as she showed you the vibrator in her hand. Immediately your eyes widen and you shake your head wildly. That thing was almost enough to make me pass out!

"Nuh-uh-uh" she said "You said you wanna cum, I get to decide how..." she forcibly holds you tight to herself, her hand around your neck as she slides the vibrator directly to your clit, making you cum immediately, and just like before, Gwen doesn't stop. You see yourself spasming wildly in Gwen's grip in the mirror, but there is little you can do except witness your own helpless body get tortured by your big sister. You feel your ass spasming around her cock, even as she thrusts in and out.

"F-fuck... cumming..." Gwen moans again as she pushes her cock as deep inside you as it will go, shooting rope after rope of cum into your otherwise empty bowels. She presses the vibrator into your clit a little harder, pulling another orgasm out of you and enjoying how it makes you spasm around her cock. Eventually she releases you and you fall face down onto the bed, completely exhausted.