We have been married well over 20 years and the kids have grown up and left home, My wife who has a well paid job for which she has to be assertive and coinfident which over the years has made her the same at home. For quite a while she has been telling me that my cock which is about 4 and 3/4 inches when erect and not very thick is not giving her the orgasms and satisfaction that it used to , i have said that its probably about average size but she had been online checkimg out some sites and told me that she wanted to try a larger cock to see if it would give her the satisfaction she craved, I pleaded with her not to but to no avail eventually she had contacted a man through the internet who offered to give women satisfaction and claimed to have a erection of 7 and a half inches and was very thick and a heavy cummer. I was given no choice and a date was arranged for him to come round to the house and he did not mind husbands watching, my wife had her hair done also nails etc and bought special sexy lingerie black stockings , sexy suspenders, tiny panties , matching push=up bra and killer heals when she was ready she looked stunning and i wanted to have her there and then but would not let me touch her although as a treat she did give me a nice handjob. After he had arrived and the pleasentries done it was agreed i would sit in the chair in the corner of the bedroom and take no part except for some photos as memories, he started to kiss and caress her while he was taking off her dress to revel her beautiful body encased in the sexy lingerie he complimented her on her looks and sexiness. She then undressed him down to his boxers and i could see the shape of his semi erect penis nd it did look big , she sank to her knees and slowely savouring the moment pulled his boxers down and his huge penis sprang out in her face at which she gasped, I was amazed at its size, She then took it in her hand and wanked it and it grew bigger as she took it in her mouth bit by bit , i was mesmerised and jealous also getting an erection as she gave him a fantastic blow job , his breathing increased and suddenly ejaculated in her mouth and there was so much spunk it ran down the sides of her mouth and chin at this i came and shot my cum in my boxers, but she kept sucking and was loving it. He then went down on my wife and spent a long time pleasuring her with his tongue and hands until she orgasmed ,by then he had recoverd his erection with my wifes hands and lips help at this point he the turned her over and gently entered her from behind she was loving being filled by his huge erection which made my little dick seem so inadequate at this time he increased his rytham and she met his thrusts in time and before long he shot his heavy load over back. what happened next took me by surprise my wife called me over and told me to kneel in front of him and said darling thats what a real mans penis is like as it dripped his cum and forced my head forward until it was touching my lips she grabbed my head and made me suck his cum covered dick clean at first i was horrified but accepted my fate and tasted his spunk at which she grinned and called me a cock sucker. After this they spent the rest of the night having sex in serveral positions he must have cum in at least 5 times over the evening. the next day after he had left we discussed what had happened and i had to agree with her that my dick was to small to satify her needs and agreed to her demand for regular sex sessions with large endowed men. So i have to watch her getting great sex from these well endowed guys while wanking my dick and it has become a thing of hers to make me clean their cock at least once per session and to get me used to swallowing their cum she wanks me into a glass and makes me drink my own cum.. I feel totaly cuckolded.