As the day progressed she grew more and more aggressive with exposing her “private” parts in public. She knew it made me horny every time she did ...that and judging by the damp look to her G-string wasn’t bothering her in the least. God I wanted that G-string to match the other one in my suitcase. The day passed to quickly and it was time to head to the airport. Once on the highway though both Frank and I’s phones rang. He answered his I already knew what that meant and listened to him explain. She slowly takes off her jeans, blessing me with the sight of that brown bubble butt covered with a little g-string and you could see the little bulge between her panties, I couldn't stop myself so I start kissing her ass and give her a little lick on her asshole, she undressed completely and asks me to do the same and I gladly comply.As I laid in bed, she starts to caress my balls gently and puts my dick in her mouth while she gets on all fours.. like a cute little whore. Her ass points at me. It sank to the second knuckle in her rear channel. He heard her gasp around the thick cock in her mouth.As he made little circles in her ass with his finger, Cheri's ass started revolving in the opposite direction. Then he lifted his body until he was on his knees behind her and his hips were directly in line with her ass. With one hand he guided his rigid cock to her asshole and then removed his finger.Cheri reached behind her with her own hands and carefully spread the asscheeks of her butt.. David shoved his cock deep, the rotated his hips back and forth, stirring his cock in her asshole.On and on they went for long minutes, until Pam thought her brother's increasingly harder thrusts would tear her apart. She arched her hips up to meet his pounding thrusts. David came hard, slamming his cock deep within her. Pam could almost hear the roar of his sperm flooding into her. Dave shook and pulled Pam's hips against him, pressing his cock deep so that he could fill his sister's tight,.