Will she keep it (Part1)

My SIL was over the other day and we made eye contact making me wonder if she is capable of keeping our secret.
8 weeks ago we attended a family wedding and things got a little out of hand, My wife is a short, Beautiful woman with small saggy breasts but a decent body even after having multiple children, Her half sister was born out of a oops situation when their dad banged a local woman after a night out and knocked her up leaving my wife to have a 25 year younger half sister, The two of them look similar as far as their faces, Both pale skinned, freckly, Both brunette, Both blue eyed and both beautiful but that's where the similarities end, My SIL is 5'10" tall, Slim built with skinny legs, A TINY almost non existent ass, No hips, A weird little muffin top, Flat stomach and huge tits, She is very awkwardly built but if she dresses just right she looks ok.
While at the wedding we had a bunch of drinks and my SIL's plus one was a friend of hers (Cassie), My wife and I were at the table and she was pretty drunk already but her sister and her friend were dancing and having Fun, My SIL was wearing a 3/4 length green skirt that sat kinda low due to her lack of hips and a white shirt that had a built in bra but due to the size of her tits they were bouncing a lot. I was just sitting having a drink and sorta watching them, Her friend was wearing a pretty short denim skirt and a tank top and they looked pretty good out there dancing, At one point my wife said "Sister in law", I looked at her and said "what?", She said "She's your 19 year old sister in law", I said "Uhhh, Ya....And?", She said "Stop looking at her like that", I said "Pffft, Whatever" and she sat back acting all pissed off, About 10 minutes later she put her head down on her hands on the table and within minutes she was having a little nap.
My wife had on a very nice dress but sitting the way she was she was almost slipping one of her saggy boobs out the side, I waited a bit until no one was looking and then I just tugged her dress a little and it slipped out so she was just napping there with one little saggy titty hanging down with her little pink nip pointing at the floor. I got up and went to the bar for a drink and talked to some people but I kept an eye on my wife to see if anyone noticed, There was a group of younger guys at the next table, Her two nephews, Her cousin and two guys from the other side of the wedding, I was surprised it took as long as it did but finally her nephew noticed and looked around, I pretended not to be looking at them and he nudged his cousin and nodded toward her, Soon the whole table was looking and giggling and even some pictures were taken, I stood by the bar and watched for probably 20 minutes as at least 25 people by my count glanced or stopped and stood in a spot where they could take a look without being too obvious and finally her cousin Brandy sat down next to her and blocked the view, Woke her up and helped her fix her dress.
I pretended I had no idea what was going on and no one ever said anything about it so I left it alone, My wife stumbled over to me a few minutes later with her cousin and said "We are going back to the room", I said "Ok, I'll be along in a bit", She had obviously forgotten about being mad at me and kissed me, Said "Love you" and stumbled off, It wasn't all that long before her sister came and asked me to go to the bar with her and her friend which was just a block away so I said "Sure, Why not", We got a table at the bar and the two of them were dancing and having fun, After a bit they came and dragged me to the dancefloor and after the second song a slow song came on.
I was like "Ooohhh, ok" and went to head to the table, My SIL said "Wait, Dance with me, We can slow dance, We are family", So I agreed and we started dancing as her friend headed to the table, I awkwardly had my arms around her with both hands high on her back and she looked at me, Said "What are you doing?", Took my right hand and pulled it down to her hip and then pulled my left hand down to her lower back, She put her head on my shoulder and we continued to dance, She was moving her hips and swaying as we danced, Her huge tits were pressed against my chest and she looked up at me and said "You smell really good", I said "thanks" and we kept dancing, After that song was over we went back to the table to join Cassie and the way she was sitting I could see up her skirt and just the perfect amount of light, the perfect position and I could see a little bit of pubic hair.
I took a look and then looked away when Cassie changed positions and said she had to go to the bathroom, She danced off and my SIL laughed and leaned over saying "I seen that", I said "Seen what?", She laughed and said "Cassie only owns 10 pairs of period panties and otherwise never wears any no matter what", I felt my face get hot and she laughed saying "Awe. You're so cute when you blush". I was a little weird and nervous but she seemed to be liking embarrassing me and slid her chair right next to mine and said "When was the last time you seen a 19 year old pussy?", I said "Oh my gawd" and she said "Oh please, Like you don't talk about that stuff", I laughed and thought for a second and said "Honestly...Never", She said "What?", I said "My first gf was 21 and we were together from when I was 18 to 24" and then every girl I dated was over 21 after that so technically never", She laughed ad said "well, I am sure you have had no shortage of vag", I said "well, Only one for a long time", She laughed and said "I always wondered if ours looked the same...Noting else is the same" and she cupped her boobs, I laughed and said "No, Definitely not the same...Can I ask what size they are?", She laughed and said "You make me laugh, You're always so careful not to be inappropriate with me, Of course you can ask, They are DDD", I acted surprised but actually wasn't and said "Holy shit, HAHA".
We had a few more drinks and she asked "Where is Cassie?", I shrugged and she wandered off to find her, A few minutes later they came back together and they sat down, We had one more drink and they announced last call, We decided to leave before the rush and started walking back to the hotel, We went up to the 4th floor and my SIL asked me to walk them to their room, I did and when we got to the door she invited me inside, We scrounged up 1 beer, 1 cooler and 1 ceasar in a can and sat down, Cassie was sitting on the couch next to my SIL and my SIL blurted out that I have never seen a 19 year old pussy and that Cassie should show me hers.
I was like "Whoa....No, No" but Cassie laughed and said "You're his sister in law, Show him yours", She laughed and said "Nah, He'd rather see my tits probably", Cassie said "Well ya, Who wouldn't?, Same time?", My SIL shrugged and said "OK". I swear my heart stopped a little, I swear it skipped a beat or 10 as Cassie lifted her butt and hiked her skirt up as my SIL grabbed the bottom of her shirt, wriggled and wrestled and grunted, Cassie kept her legs together as we both watched my SIL suck her chest in and pull her top up flopping out her humongous, Beautiful tits, I looked at Cassie and she spread her legs, I gulped and said "I...Uh...I...Holy fuck", I didn't know where to look first or second or at all but Cassie has a beautiful little brown pussy with just a little bit of curly dark pubes and all three of us were looking at it, My SIL said "Geezus Cassie...No wonder your step dad has a hard on every time he sees you if that's what he spies on", Cassie laughed and said "He's such a perv but fun to tease", Then we all looked at my SIL's tits and Cassie said "Yup, Still perfect", My SIL said "Well you just seen them this morning when we were getting ready", My SIL's hands looked tiny cupping her huge tits, She has tons of freckles on them and her areolae are big, Pink, Bumpy and her nips are small in comparison but still probably twice the size of my wife's.
There was a lot of giggling and then my SIL just pulled her top over her head and tossed it on the couch saying "Oh my gawd it feels good to get that off" and scratched and massaged her massive boobs, Cassie looked a little surprised and my SIL said "Pffft, Whatever, He has seen them now so who cares", Cassie still had her skirt hiked up and pulled it down, My SIL said "Show him yours" She looked at me and said "I wish I had tits like hers" and Cassie just whipped off her top, Unclipped her bra and let it fall, Cassie is a little bit darker skinned, Possibly part first nations or part black or something, I am not sure, Her tits are way smaller but still a healthy C cup I would guess with dark brown nips and her areolae are really bumpy wrinkled up and her nips are the size of a pencil eraser but not as long.
I was sitting there about as shocked as I could be and Cassie said "Why are we both half naked and you're fully dressed", My SIL laughed and said "Hey...Ya", I shrugged and whipped off my shirt, Cassie said "Keep going", I said "You guys first" and to my shock they both stood up and dropped their skirts, My sister in law is pale skinned and has a bald, Pink little pussy but Cassie's is brown and has hair, I am not shy about my body, I work a physical job and am in good shape and although my dick is only 7.5" long it's thick, I undid my pats and shuffled everything down at the same time, I was about half hard which was perfect because it showed off my girth but didn't look hard, Cassie sat still leaning forward staring and my SIL said "Geezus Christ", No wonder my sister is so loud when you guys fuck", I laughed and Cassie blurted out "Oh fuck" and clenched her thighs together, Me and my SIL laughed and Cassie said "Holy fuck that's a nice dick".
See part 2 for the good stuff.

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