I am erect just from writing this
My wife, Sarah, and I, have been together since university. She is a slim, sexy woman, with a 'bob' brunette hairstyle, a full bush, and a face which some would describe as a 'plain jane', although they never would say that if they had seen her naked and aroused.
Throughout our three years at Uni, we managed to remain 'technical virgins', partly because she was a preacher's daughter, we never went the whole way. We slept naked together every night, and our sex life typically consisted of her lying on top of me, and rubbing her pussy against my erect penis, until she orgasmed, and then, sometimes, but sometimes not, she would finish me by hand. I think she had a slight fear of sperm.
After marriage, during the course of our 'marital relations' we became more uninhibited, and started sharing our fantasies verbally, her much more so than me. By this stage we were in our mid-twenties, and my darling Sarah revealed to me her fantasies (which often manifested in dreams) of having sex with young (18+) teen boys)
I must confess to being initially very jealous and hurt that she had such thoughts, but at the same time, both of our orgasms were more intense when we shared this fantasy, and she would frequently wank me off whilst I described to her what a hypothetical young lover might do to her, either with me watching, or me consigned to the spare room. Truth be told, whilst I could not bear the thought of anyone else mounting her, I became utterly obsessed with the thought of her having fun with a naked young lover, and I told her so.
About six months later, our fantasy finally became a reality. We needed more money, and decided to let a room in our house. Naturally we chose a male student, and gave him a preferential rent. Steve was a very good looking guy; slim, blonde, and with a lovely body; not a 'jock', just slim lythe and toned. It became very clear that in his own shy and polite way, he fancied the knickers off my wife.
Initially he just lived with us as a lodger, and nothing happened except Sarah becoming increasingly horny at the thought of what she might do with him; and I benefited greatly from this. One night, as she and I were making out nude, I just said; 'go to him, but be sure to return to me and tell me all about it'
What then happened (and it continues to happen) really blew me away. On that first occasion, she uncoupled from me, gave me a teasing kiss, and went into his bedroom clad only in a black thong. She sidled up to him, french kissed him, and proceeded to take his cock in her hand. She later said it was not that big (maybe a little over five inches), but it was quite fat, and ultra-hard. She made him cum copiously with ease, and re-entered our bedroom with his cum all over her hand. Flashing me a smile, she grabbed hold of my cock, and proceeded to wank me off, using his young fertile sperm as a lube. I had the strongest orgasm of my life.
Many more things happened, which cannot be described here, but I just wanted to share this with you all, and maybe I shall narrate other things soon. Right now, Sarah and I are in bed together. She has just come in from Steve's room. On the occasions she goes in there, she is there for longer and longer periods. I think maybe more is happening than just her masturbating him, but the effect on our sex life is just too good for me to ask too many questions.