Not even close

Standing up quickly, you grab Gwen by the shoulders and throw her down on your bed before climbing on top of her. Hastily, you sit down on the strap-on and rock your hips.

Gwen sits up and lifts your shirt before latching her mouth onto one of your nipples. Your hands moved to her breasts, but you were too busy fucking Gwen's strap-on to do much else but fondle them and use them to support yourself.

You bring yourself to a second, third, then fourth orgasm, bouncing on top of Gwen before you collapse on to her chest.

Your sister strokes your hair off of your slightly sweaty face and kisses your forehead.

"More," is all you manage to get out as you crawl off Gwen and lie onto your back, your legs sticking up in the air.

Dutifully, Gwen positions herself between your legs and penetrates you again. She teases your clit as she thrusts into you again and again.

Finally, after another four orgasms you tell her to stop.

Not bothering to pull out, wanting the moment to last longer, Gwen lays down on top of you and kisses you.

"I'm so glad you changed your mind about us," Gwen purrs.