The lifeguard doing her rounds

You see the female in a tight, red one piece bathing suit with the universal lifeguard logo not even 100 feet away. Your sister decided to reposition herself to also get a better vantage to see if the lifeguard was still approaching. Her quick movements caused her ass to sandwich your rock hard dick. You could feel your erection trying to bury itself further inside her, which caused both of you to simultaneously groan and moan. “Bro…ughh…careful back there-re-re with that…ohhh.”

Your dick had found its way to the entrance of her asshole as it was trying to drill its way inside of her. The lifeguard’s voice surprised you both as she says, “Hey you two! Sorry to bother you.”

You smile and say, “No worries, ma’am. Lovely weather…ugh…today” is all you could say as your sis pushes your dick inside of her asshole. She lets out a quiet groan herself as she slowly gyrates her hips under the towel. You feel her tight asshole slowly eating more and more of your girth.

Suddenly, the lifeguard bends down and puts her shades on her head. She can clearly see the towel moving with each thrust and smiles. She removes the towel in one quick pull and see that not only are you two fully naked but your cock is being devoured by her ass. “Fuck that’s hot…” is all she can say as she bites her lip. You begin to thrust your hips into your sis as your dick slides in and out her tight asshole. She lets out moans as you decide to put on your show for the sexy audience that may quickly turn into a threesome.

She quietly watched as you two continued your impromptu sex session. You were fully expecting her to chastise you but instead she said, “I actually saw you two stripping down and saw the sexy rubdowns. I was wanting a closer look of what was about to happen. I didn’t expect public sex to be on my bingo card today. Especially one so blatant as yours.”

Sis eventually spoke through her moans, “Uhhh…are we in-n-n trouble?…aghh. We can get out of here…ohhhh…if you need us too.” You continue to fuck her asshole knowing this may be your only shot at sex on the beach.

She continues to watch and says, “If you were in trouble, you would have been dragged off the beach naked already. Some of my other coworkers would have done that…not me though. You two are very sexy and I will let you off with a warning if you do me a favor.”