Naomi and I got Mike's phone number before we left and we got together with them again only about a week later.
Tina was just as shy and nervous at first as she had been the first time, especially when it came to getting undressed. The reason why was revealed when she turned away from me to pull her knickers down and then turned slowly back around, blushing.
Mike, inspired by Naomi, had made her shave her pussy before they came out that evening.
You've got to remember that this was before shaving and waxing was fashionable and commonplace. Even in porn magazines, the majority of models were still sporting furry beavers and a photo spread of a girl with no pubes was the exception rather than the rule.
Many women just wouldn't do it - but most men's reaction to seeing Naomi naked for the first time was to just about drool at the sight of her soft bare mound and smooth pudenda.
Tina was quite embarrassed at first - she'd only shaved just two hours earlier - but after I went down on her and brought her rapidly to one of her subtle, shuddering orgasms, she began to see the benefits.
Naomi and I got together with Mike and Tina three or four times over the next few months. Then they split up and that particular foursome was over.
The girls never put on a show quite like that first night again although the last time Mike and Tina came over to our place had its own special group moment.
We'd gone into the bedroom and had a session which started out pretty straightforward, me fucking Tina and Mike fucking Naomi side by side on the bed.
Then Mike spotted a length of rope sticking out from under the corner of the bed. It was one of a couple of lengths with which I'd sometimes tie Naomi when she was in the mood for a bit of bondage.
Mike was all for tying up the girls but his idea backfired because they insisted it should be him and he ended up on his back with his wrists bound over his head.
It was no great hardship for him though as Naomi's next move was to straddle him and guide his cock into her cunt, rocking back and forth on top and dangling her breasts in his face, teasing him.
I got Tina on her hands and knees over the edge of the bed and took her from behind so we could both watch Naomi and Mike while we fucked.
I fondled Tina's breasts with one hand while gently rubbing her clitoris with the other and pretty soon she was beginning to whimper softly in the back of her throat. I craned round so I could see her face - her expression was a mix of pain and lust as I fingered her clit while plunging my cock into her and she avidly watched Naomi riding her boyfriend.