As we have been married for some years we spice up our sex life with a few fantasies and little games one of which is for my wife Christine to tie my hands to the top of the bed and my feet to the bottom and put a blindfold on me not knowing what she is going to do and having no control over the situation is a big turn on for me sometimes she would make me come in her pussy and other times in her mouth.On this occasion we were going up to the bedroom when she said let me tie you up tonight I have a surprise for you, well I could,nt get on the bed quick enough.She tied me up as usual and put the blindfold on me then sat astride my lower body and started to rub her hands on my chest I was just starting to enjoy it when the doorbell went Christine jumped up and said I will see to it I heard some low voices then Christine came back into the bedroom who was it I said Christine just laughed and said that is the surprise.I felt her get back onto me and lean forward she put her arms round my neck and said well you keep on about having a threesome with another man and tonight its going to happen,she went quiet for a little while and I said whats happening she said I am just sucking his knob hard so he can fuck me,I did,nt know what was going on because of the blindfold she then got of the bed and must have leant forward to suck my dick then she stopped and started to give a little moan of pleasure whats up I said she replied he just put it in me,I thought she is making all this up but then I could hear the pounding of him going in and out of her then it all went quiet again, he must of taken it out because she got astride me and held my dick that was rock hard she then put it straight into her pussy that was so wet by now which was a good thing because I could feel something sliding in next to my knob I then realised it was his dick it felt a lot bigger than mine as it rubbed against me, as he fucked Christine the excitement was too much for me I could feel myself cumming then I could feel his dick starting to throb against me when we came it was like an explosion our two dicks throbbing and shooting together and Christines pussy pulsating and gripping us both the noise we made must have been heared next door but never mind.After a while he pulled out and Christine got off me then she said in my ear was it as good as you thought it would be all I could say was Yes Yes,she took the blind fold of me and I could see a man about the same age as us Christine said it was one of her old boyfriends who she bumped into recently she had,nt seen him for years and they got chatting about different things and the subject of fantasies came up,next time I might not use the blinfold so that I can watch but somehow not knowing for sure is quite a turn on.