The next morning I woke up to the sounds of clattering from the kitchen downstairs. It was pretty early and my head was still sorting through the activities of last night. After Jackie and I had finished having intense sex by the pool and on my bed I had seen that Erica might have actually come home while we were in the middle of it. If she had she definitely would have heard us going at it and I wondered about her reaction to me fucking her mother.
It was still early but I pulled on a t-shirt and some simple shorts and went downstairs to find Erica alone in the kitchen looking strangely at a frying pan.
"It's a pan. You cook things in it." She gasped and turned around quickly.
"You jerk! You scared me." She said. "I didn't think you would be up for a while." I didn't know right away if that meant anything.
"What do you mean?" I asked cautiously.
"Yesterday you slept until noon. I think you stayed up a bit too late the night before." She winked at me and I could feel a deep flush enter my cheeks without warning. Seeing my flushed face and open mouth she laughed.
"Want some coffee?" She asked which broke the tension. I nodded and she quickly pulled a mug out of the cupboard and handed it to me. I was having a hard time looking her in the eye.
"So, I thought maybe you and I should spend some time together today. It's not every holiday I get to break in a new brother. Plus all my friends are busy." She grinned.
"Um...thanks?" I said again with a bit of caution. She had to know that I had already seen her naked, but she hopefully didn't know I had also masturbated to one of her videos and then had intense sex with her mother. If she did, she certainly wasn't going to talk about it right now. That wink had thrown me off a bit.
"Why don't we go work out after breakfast and then hit the mall. Sound good?"
"Definitely." Seeing her in workout gear really appealed to me and she seemed really friendly. Maybe she and I could really have a bit of friendship together. I still couldn't help but notice how her long lean legs tapered into a pert ass in her shorts. She was almost the polar opposite of her mother. While Jackie was round and larger in all the right places, Erica was smaller and leaner but much sleeker. Her body was shaped almost like a gymnast, and I already knew how flexible she was.
"Okay! Car leaves in an hour." She quickly left the room and I was left alone to contemplate spending the day with her and think about Jackie. She was obviously at work for the day, but I was conflicted as to what might happen when I saw her tonight. Would she treat me like nothing had happened or would we end up in bed together again? There was also a certain amount of guilt that I had just fucked my father's soon to be wife last night, and not only that, but she enjoyed it when I called her Mommy. Just thinking about it made my cock stiffen. It was going to be a long day.
After finishing breakfast I gathered up my gym gear and met Erica downstairs. The drive to the gym was quick, but we easily chatted about school, working out and other things. It was really easy to talk to her just like it had been the first night and it relaxed me. Hoping that this was just going to be another day with my new stepsister, I told her I would meet her on the cardio equipment and quickly got changed.
As I warmed up on a bike, Erica walked into the cardio area and I saw every male head turn. She was wearing tight black booty shorts and a thin bright blue sports bra, and that was basically all she had on except for her bright sneakers and her hair in a tight ponytail. There was nothing left to the imagination. If I didn't already know what she looked like naked I would have had a good idea now. There was a nice camel toe clearly visible at the crotch of her shorts. As she walked past the other equipment every guy slowed down to stare at her ass.
"Hello brother. Ready to sweat?" she said, hopping into the bike next to me. I put my head down and pedaled harder, trying to resist the urge to ogle her while my cock started to stiffen as a response to the friction on the bike and of course, her outfit.
"What were you going to work on today?" I asked, hoping that she wouldn't say...
"Legs, of course! Have to keep the booty nice and solid!" While I gulped, again another shot of adrenaline flowed into my cock. Watching her work her legs while dressed in shorts like that was going to be extremely hot.
We finished our cardio and walked into the weight area, where again most of the guys lifting weights stopped briefly to watch her as we walked around. She was friendly with some of them and stopped to say hi, always making a point of introducing me as her brother. When some of them looked surprised she just smiled.
The next half an hour was pure torture of the best kind. Our first exercise had her lying forward on a bench and curling her legs up, but also forced her to push her ass up in the air while grinding herself into the bench. Every time she exerted herself she would grunt and as she moved her ass would squeeze tightly in her shorts. When I was doing it she made a point of standing right in front of my head where her crotch was clearly visible. Her camel toe was clearly visible from that angle and it was obvious there were no panties underneath her tight shorts.
The next was squatting, where she would squat down and again stick out her gorgeous ass at me, but this time asked me to spot her from behind. She made a point of asking me to keep my hands on her bare waist, which by now was damp with sweat. If we had been naked I would have easily been able to slide into her from behind and being so close to her and watching her muscles flex got me extremely hard. As she moved up and down she grunted and moaned every time. Other guys were just stopping their workouts to watch her put on a show.
The last part of the torture was again watching her bend over with a bar in her hands and her legs straight, extending them fully so her ass cheeks stretched. This made it so that her pussy encased in the shorts was clearly puffy and visible. Again as she worked every time she lifted she would give a sigh, grunt or gently moan. Every time she did that I could only think about the sounds she would make lying underneath me if my cock was moving inside her.
When she announced that we were done she said she needed to stretch. Quickly she grabbed my hand and pulled me into a studio that was off to the side and empty. Laying a couple of mats down on the floor she lay down and we started to stretch lightly. All I could think about when she lay there was rolling on top of her, ripping her clothes off and fucking her hard right there on the floor. I was as turned on as I had been yesterday when her mother was teasing me by the pool. Both of these women really knew how to use their bodies to their advantage. My cock was fully hard and ready for anything.
There was a glass door so that people could see into the studio but we were positioned so that we were off to the side and someone would actually have to walk in to see us. As she lay there she asked if I would help her with one stretch.
"My hamstrings are really tight." She said. "Grab my leg and just put it up on your shoulder." I knew what she was talking about but gulped again, knowing what position it was going to put me in.
