Their needs were too urgent to waste time undressing. 

Backed against the kitchen counter, she tugged aside her bikini panties and fingered her moist crevice while impatiently watching him remove his shorts. Then her eyes gleamed. “Fuck, that’s one gorgeous erection. Come on, stick it in me, quick.”

Her legs wrapped around his waist, he gripped her buttocks and they gasped at the magical moment of penetration. Immediately, frenetically, he pounded her glistening pussy as she clung to his neck, rocking and groaning.

“Oh fucking hell,” she panted into his ear as they both came, “my sister’s a lucky cow.”