Having planned my bike ride route for the afternoon, through the park , down to the canal, along the tow path , through the woods and back home through the lanes, I prepared my bike in the garage, attaching a girthy 7 inch dildo to the saddle with zip ties and tape and made a hole in the back of my cycling shorts, applied plenty of lube to the dildo and my bum and then got astride my bike and slid myself onto the black monster, after a small amount of adjustment I got the positioning just right and was ready, my garage door is electric with a fob enabling me to open and close it whilst sat on my bike, so off I went towards the park. It felt great riding along passing people and saying hi and good afternoon with them all totally unaware that I had a huge black dildo up my bottom, the harder I rode the better the feeling especially when bumping over curbs etc, once in the park a couple of other cyclists appeared and rode along side me, chatting as we rode, them not having a clue as to my naughty saddle addition. We left the park and got onto the canal path, it was quite narrow and only allowed single file riding, the other two went in front and I followed behind, I was feeling very aroused by now and even did a few cheeky rises on the shaft of the by now sopping dildo, the path was quite rough and my cock was getting erect from the vibrations traveling through me, we soon reached the exit from the tow path to the woods and all stopped for a while for a drink and a chat, needless to say I did not get off my bike. after a bit we all set off again into the woods , the terrain was far more severe with tree roots and small jumps to deal with and as our speed increased my ass was getting a pounding and it was not long before I came in my shorts, we cycled on crossing a river and then up a steep incline, the feeling in my bum was amazing as my muscles worked hard to get up the hill, I was having such fun until around the next bend we encountered a huge fallen tree blocking our way, the other two dismounted and climbed over it with their bikes, I now faced a huge dilemma, look stupid and turn and go back, or dismount and run the risk of them seeing a glistening black dildo strapped to my saddle, they both seemed to be looking forward waiting for me, so I got off and very quickly clambered over the tree doing my best to shield my bike from their view, great I was over and back on, being pretty sure they had not seen my dildo I caught them up and on we went, soon the track narrowed and feeling a bit cocky that they still knew nothing of my kinky little secret I took the lead but then disaster struck, I slid on some loose stones and fell over sideways luckily my bottom still firmly planted on my saddle, but the others rushed to help and picked me up and to my horror there I was being helped to my feet with a steaming , gleaming wet dildo on full view, one of them exclaimed , Wow, the other just stared at me and smiled, he then said calmly, I think the less said about this the better. I felt about 2 inches tall at this point but just thanked them and got back onto my bike, dildo safely right back in, we rode on and exited the woods , they said they were heading right to the pub and I turned left and cycled home through the lanes as planned, as my garage door closed behind me I breathed a huge sigh of relief, took the dildo off my bike and went to get showered etc, a lucky escape I thought to myself, but deep down kind of wishing it gone a bit further with the smiley guy. Later that evening my doorbell rang and to my surprize there in my porch was the smiley guy, he said he hoped i did not mind him popping round, but he had recognised me from earlier and knew where i lived as he was my postman, I asked him in and made him a drink, we chatted for some time and one thing led to another and we had amazing sex in my front room. ever since that day he pops round most mornings after his rounds and fucks me on a regular basis, usually against my kitchen sink with me still in my dressing gown doing the dishes from the previous night. We also go for bike rides together now and then, he also has a special saddle now.