Fuck her in the ass

I pulled my finger out of her butt, and pulled her into the water with me.

"Why did you do that?" She asked with mock coyness.

"I wanted to see if you would be into it."

"That hurt." She said pouting, sticking her bottom lip out. I knew that she was playing now. I scooped her up and waded with her over to the shallow end. I had her kneel on the stairs, and I bent her over. I quickly stuck my tongue in her ass again, and then positioned my cock over her tiny little asshole.

"This is going to hurt too." I said. I pushed my cock into her ass. There was some resistance, but soon the head of my cock slipped into her ass. She gasped loudly.

"I've never done this before!" She squeaked. I almost called out 'bullshit', but I didn't want to break the scene we were building. I reached forward and slid her bathing suit straps off of her shoulders, freeing her large tits. Jennifer reached down and began playing with her pussy while I fondled her tits, and tweaked her nipples. My cock slipped into her ass a little deeper when I reach over to grope her tits. She let out a loud, pained moan.

"Uhhhhh...be careful! My asshole is so tiny."

"And tight!" I said, starting to slowly pump. She made these little whimpering noises as I fucked her ass, and it turned me on.

"Oh...God...My ass...it hurts..."

"I warned you." I said, giving her a slap on her ass.

"It...Hurts...So...Good..." She moaned.

"You like getting fucked in the ass?"

"Yes. God...It's so naughty...I'm such a bad girl..."

"Yes you are," I said, slapping her ass again. The spanking elicited a yelp.

"I'm so naughty...I should be punished for being so bad." I could feel that her ass was loosed up a bit so I decided to be daring and I thrust my cock all the way in. My balls slapped her pussy.

"OH..MY...GOD!" She screamed. "Your dick is huge!"

The tightness of her ass, her dirty talk, and my case of blue balls pushed me right to the edge.

"Oh, god! I'm going to cum!" I said.

"Cum in my ass! Please don't pull out. I don't want to have to clean your jizz out of the pool." She said in between grunts and moans.