After I had heard my sister in law, Margaret, suggest to the missus that she should accompany her for a walk up the beach, please see previous stories, my mind is racing a bit on what is going to happen, as I am pretty sure my missus hasn't a clue what her sister is doing on these walks. So I am sun bathing as usual with Richard, who is disabled and cannot go on the walk as he is not strong on his feet, the missus and sister in law, wondering what the first move will be. Finally Margaret says to my wife "do you fancy a change of scenery and a walk up the beach, Jim can stay with Richard etc" , so they get their bits together and are on the move. Once they are around the corner and out of sight I say to Richard that I need to go back to the hotel room and get him a drink so he won't need anything else. I leg it along the dunes and get to the headland just behind them, and they are 100yds ahead of me walking along the waters edge. Sister in law and the wife are engaged in conversation and suddenly the sister in law takes her bikini top off, good job I have the camera this time and I get a nice photo of her albeit from a long way off. Its obvious to me that she is trying to get my wife to do the same and eventually she does. I get another nice photo as well. I am getting a bit hot under the trunks now seeing Margaret again and my wife with their tits out, my wife only went topless once when we were young and in those days I was much more jealous of the Spanish waiters drooling over them at the time. Now however it makes me feel randy that someone is getting the hots on my wife's tits. Fortunately neither of the two of them are looking to see if I am following so I close the gap a little to a bout 50 yds so I can get some nice shots, both the sister in law and wife have poor vision - I don't think my wife would see me from 20 yds so I I am ok. I take a number of photos as I go along. Its always fun to see 50 years old ladies with good bodies and their tits out. After 5 mins they go around the headland which separates the topless from the nudist beach and here I have to climb up the dunes but get a good view back around the corner as they approach. Waiting for them are the 2 guys who fucked the sister in law yesterday, both in the nude but must be 100yds from the corner. Sister in law comes around the corner, sheds her bikini bottoms and I get a great picture of her in the nude, my missus is a bit reticent but finally gets her kit off as well, I am wondering what is going to happen as my knob gets stiffer by the second. I get good view of their minges, sister in laws being smooth and my wife's with a neat landing strip, they both have large beef flaps hanging down must be a family trait - i bet they don't realise! Eventually Margeret sees these two guys and gives them a wave and they walk along to meet them, she gives them both a hug, I can see that my wife is unsure what the protocol is for these type of introductions. I am not sure what she has been told as they didn't have that long to discuss what she had got up to for sure. Anyhow they wonder along the beach a bit and then take a right into the dunes not too far from where I am sitting so I crouch down and hope that they don't see me, they are heading for a small private spot next to the one she went to the other day so. Its not long before Margeret is on her back with these two guys rubbing sun lotion over her and she is beckoning my wife to join her, my mind is spinning on what I am going to see, my wife is clearly not enthusiatically joining in, which I expected. So these two guys are giving sister in law the rub over and the wife is sitting there not too sure what to do, especially when one of them offers her his cock to take in her mouth. She has never been keen to do this and I have had no success and this guy doesn't get any but she does take it and starts to wank him off, a strange feeling watching your missus walking a guy off. Sister in Law has a cock in the mouth and is giving it some when they break off and she goes onto all 4's, he is straight in giving her some really good fucking, I can imagine those beef flaps going in and out as i get out the tadger to have a wank, my cock is covered with pre cum and I am in heaven. Not as much as sister in law who is really enjoying herself. Meanwhile the two guys do a quick switch so my wife is wanking one and the other one is fucking her sister. they switch a couple of times and finally one shoots his spunk over my wife's tits and one over her sister's arse. Sister in law then gets up wipes her the spunk off her arse and then does to lick the spunk off the wife's tits, this is too much for me and I leave mine on the sand. The two guys join in and give the wife a quick rub over and she is really enjoying it until they try to fuck her and she is having none of this, good girl, as I don't want he fanny spoiled for my cock later on as the thought of sloppy seconds is a no no for me. The sister in law tidies up these two guys cocks by taking them in the mouth, and they all pop off to the sea for a dip and wash down. I take a few final photos and head back to Richard as quickly as I can. I clock in with Richard, cover my tracks as best I can and wait the arrival of the girls, the trouble is they don't come back for another 1/2 hour and as its only a 10 min walk - I wonder have they had a second session? That afternoon when I get back I try it on with the missus and she is as randy as fuck, so me thinks she didn't get any cock but I kind of wonder if he got her to suck his, hopefully she did which means that maybe I will have a chance. So I give her a really good fucking her piss flaps must be as sore as hell and as I am fucking her I slip a finger is the arse, she likes this but has been off it for a bit, as I pull the finger out I am sure there is spunk on it. So I pull my dick out of her fanny and it slips in too easy into the bum, I think I am right but its too late by them as I am going like a train. She gets the spunk right up her arse as I rub her clit and flaps with my fingers, she is in ecstasy - thank you sister in law and the 2 boys! All i need now is to get her to suck my cock. Later that evening I ask Margaret if she enjoyed her walk and she politely tells me to mind my own business, the photos are going to come is useful one day for sure!