If you remember, the last time I posted on here, Mel’s parents had invited us for dinner on Friday evening, instead I told Mel to call them back a few days later and tell them that we were taking them out to dinner and we would pick them up around 7pm. The Friday came, and Mel was really nervous. We dropped Jessica off at Mel’s sister's house for the night and drove to her parents. She was worried that her parents may be very hostile towards me because I was old enough to be her dad, in fact I’m older than her parents. The meal went without any problems, her parents were as nice as anything and on the way home, her dad actually said “I was worried that she had hooked up with the wrong kind of person, but I can see you’re not. And the way she talks about you and how you look after our granddaughter, we are happy for her.” - obviously that was their sign of approval! They did ask during the meal, if I was married, all I said was separated and left it at that. Technically true, I’m separated every six months! On the way home, after dropping off her parents, Mel was ecstatic that they liked me and she said she wanted to celebrate - I knew how she wanted to do that. Mel decided that she wanted to do something different, something she hadn’t done for a while. “Let’s go to the picnic table” she said, but the rain had started and I suggested we went home. But Mel was insistent, she wanted to fuck naked in the rain in the middle of nowhere. I said it was about 30 miles away, but she begged. I couldn’t resist. As we arrived and pulled into the dark lane, there was another car there. It was clear the car was occupied as the windows were steamed up. I drove passed and pulled up. Switched the engine and lights off. Mel switched on the interior light and slipped off her dress, then her bra releasing those lovely tits of hers, then her knickers, but she left on her hold-up stockings. My cock was already hard, and she said “strip off, you’re going to take me to the bench and fuck me!” As we got out of the car, the rain was cold, I looked back at the other car and could see the wipers going and someone looking through the window. I mentioned it to Mel and she giggled and said “perhaps they’ll come and watch too” We found the table, the rain was light but constant. Mel sat on the table and said “fuck me again the way you did last time we were here”. So I knelt down and started to lick her smooth pussy, after a few minutes, Mel said “company”, I didn’t stop licking at her pussy but could see a young couple, no older than Mel walking over to us. The girl had a similar figure to Mel, but her tits weren’t as big, she was wearing a coat over her shoulders and she was holding it shut. The guy had a coat on, but no trousers. The guys said “we saw you get out naked and thought we’d come and watch, if that’s okay”, I nodded and Mel moaned a ‘yes’ as her orgasm was being to build. The girl had only one hand showing and the boy had his hand under his coat, obviously wanking. As I began to finger Mel, I looked over to the couple and said “don’t be shy, it’s obviously you’re naked, drop the coats”. The girl looked at the boy and then timidly let her coat fall from her shoulders, she stood there naked, then he did the same. After a few minutes she pulled him over to the other table and said “ do what he’s doing”. Mel’s orgasm was beginning to peak and she pulled my head into her again, ensuring my tongue was deep in her vagina. Her orgasm peaked and she slumped on the table, panting and watching the other couple. A few minutes later the other girl orgasmed and let out a loud moan. By now we were both soak due to the rain, but that didn’t put Mel off. She said “fuck me like you did before” and she knelt on the bench seat. I stepped up behind her and slipped my very hard cock into her very wet pussy, then grabbed her tits and began to slide in and out of her. Mel looked across and saw the other girl getting into the same position on the other bench, then she called out to the girl “do it here”. The other couple came over and the girl squatted on the seat opposite Mel, Then the guy stepped up and slide into her from behind. I was sliding into Mel hard, her tits were swinging back and forth so I grabbed one and started to squeeze the nipple, milk started to flow out - normally I let some collect in my hand then lick it off, but Mel said to the other girl “have you tried this”. The girl shook her head, Mel moved forward and offered a tit to the girl, who readily started to suck her tit. This moved Mel’s orgasm up a notch or two, as the girl sucked she moaned, as she moaned I thrust into Mel, as I thrust into her, the girl sucked harder and the boy fucked deeper, as he fucked deeper the girl moaned more. Within minutes we are all cummin, the boy pulled out and shoot his load over the girls back, I came deep inside Mel as she pushed back hard to capture all my cum. We all collapsed on the bench. A moment later I said to Mel “I didn’t know you were bi” She said “I’m not I was just curious”. The girl said “I’ve never tried it, but I want to”, then she said “do you swap”. Mel said “never done it before, I’m trying to get pregnant, so I only what his cum in me”, then she thought for a while and said “but I think I’d suck”, The guy didn’t seem happy with this and said they had to go. As he walked away, the girl gave Mel a hug and whispered something, then left. A few minutes later we walked back to the car and I asked what she had whispered, but Mel said “tell you in a minute”. I keep a towel in the boot for emergencies so we dried each other off and slipped on our clothes, When we drove home, Mel said that the girl had said ‘be here same time next Friday, I’ll be here without him’. I said that I didn’t have a problem with Mel experimenting with another girl, but I would with another guy. Mel laughed and said “don’t worry, I only want your cum”. We drove home and then showered and slipped into bed. Mel woke me about an hour later saying she was horny and so we fucked again.