Girlfriends sister

For context I (m38) and (f28) girlfriend were waiting to close on the purchase of my first home. during the weeks before closing we went back and forth between her mom's and my mom's. GF has noticed her mom staring at me too long sometimes and was upset over this. I wasn't stupid and knew she had and probably still was.. either way I figured it wasn't the time and eventually id catch her... Her younger sister still lives at home. She was very cute 19, body just sexy as fuck. We will call her (A) (A) Had a friend who basically never left her side (J) It was brought to my attention by my GF, she overheard the younger 2 talking about me.. she wouldn't say what she heard which made me chuckle and just say whatever..

At that time I had built campers for several years and worked with the GF in the evening at a wing joint. I did that for some time with her, different shifts ,we never seen each other and it was only for a short while..

Which.... The younger sister and her friend along with other very sexy girls who "noticed" me and God forbid she be the only one who got attention...

Anyways..I had been shooting roids and had been bulking up..
One night I ended up hitting a dude out back of the restaurant and he flew right out of his shoes lol Well... This obviously caught the attention of a few girls working there including (A) and (J), who had pretty much cornered me in the back.
Smiles and random touching my arms and chest.. That ended abruptly when my GF pops up mad as hell...

I was given a few days off to relax and rest after the incident. It was the week we were at her parents.. I show up after work at trailer factory and my GF had already left for work. Grabbed some sleep shorts and headed for the shower. I hadn't seen anyone or heard anything so I assumed I was home alone for a few.. I open the bathroom door to head to the basement. Through the doorway into the kitchen I almost run right into (A) .... Topless with only bikini bottoms on. God her titties looked so good I almost pulled her into me but I did not.. she shreeked and I mean slowly stuck her arm and hand up to cover herself and very poor job she did... She says I was tanning. Sorry lol I just looked at her as I move aside for her to continue.. She stared at me as she continued towards her room. The look in her eyes and her ass looked to jiggle with some effort thrown in there... I let her see my eyes drop to her ass.

I stood in the kitchen for a few moments and all the signs of her cheating sister ran through real quick... I went downstairs and flipped in bed.. Passing out quick. I woke sometime later.. Having a dream and it wasn't about my GF... But anyway lol the massive nut I was busting is what woke me , transferring from my dream I quickly and frantically wiping my eyes... (A) Is laying between my legs dick in hand and swallowing everything that apparently wasn't a dream.. I let out a huge groan /sigh of relief.. Looking down at her with a concerned look she just giggled and stood up, started for the door and stopped... Looking back at me... She stands there for a second almost contemplating her next words.

"If you'd like... (J) Will be here later and we can come see you??"

OMG uh... Umm fuck it..