We didn't care and eventually we started some petting, mostly through our clothes.Shelley was lean, athletic, about 5'7" and had almost platinum blond... hair. She was incredibly beautiful. I was told that I had a rugged look. I too was lean. I was taller at 6'2".By our senior year we eventually go into full disrobing. I couldn't believe how beautiful she was, even more so undressed. We didn't really know our way with sex but we were at least careful. We gave each manual pleasure for most of the. I sighed. “Why do you always turn up like this, out of the blue and always when I’m on my own?” I asked him.“I don’t know, why d’you think?” he answered enigmatically.There was silence and I pondered for a bit. Then, I decided to try a different tack; a frontal assault, so to speak.“You’re not really my brother, are you,” I said, “so who are you, really?”“Aren’t I? Hmm.”Another pause followed but I wasn’t about to give up my line of questioning; not yet anyway, so I continued, “Anyway, how did. She started sucking the head if his cock rubbing her tongue over the slit cleaning the cum as she sucked him harder. She ran her hand up and down the tie wrapped around his cock and balls. He had never felt such a mind blowing seduction ever. He just knew it felt so good. She had her mouth licking and sucking the head of his cock as her hand was stoking his cock and balls wrapped in the tie and then she moved her other hand to his asshole and shoved a finger in him and as she sucked and stroked. Ruth wore a white bikini and Helen wore a pink one. In our wedding photo Helen’s white hair was all a glow with the setting sun directly behind her.Helen joined Ruth and I in our marriage bed that night. She had her husband’s permission. He took me aside and promised me a nice bonus if I made love to his wife and made sure that she enjoyed it. He apparently did not know about our affair but had given his permission for our threesome. What a guy!That night as we were lying in bed Helen said that.