Went to stay with some family friends before a business meeting /show miles from home ,so it’s a trade show and they agreed that I could stay 2 nights at their house Arrived Saturday and had a great meal in the evening Caroline and Tim are great cyclists and went for a 7am Sunday morning bike ride and as agreed I made coffee and breakfast and then went and had a shower ,now it’s a nice house but not en-suite so went down hall had shower and went back to bedroom ,I left the door slightly ajar by mistake and as I was towelling down I heard a creak in the floor outside my door ,they have a fab 18 year old daughter Lucy who is so sexy it’s amazing , so I put the towel over my head and sneaked a look and it was her peaking through the gap Now I was getting really hard so been naked I turned round still drying my hair i faced the ajar door only about 2 centimetres open so she could clearly see me I am not the thickest cock in the world but it’s about 9 inches in length ,when hard so I put one hand round my cock and pulled the foreskin back ,so still drying my hair I could see Lucy was still there ,so I went into full on wank mode pulling the foreskin all the way back now rock hard leaving the towel on my head closed my eyes and massaged my balls with one hand and wanked like mad ,god it was so horny knowing this sexy horny 18 year old beauty was watching me and it didn’t take me long to know I was about to cum so throwing the towel on the floor I pumped like mad and sure enough wads of cum spurted out all over the towel ,I bent down and picked the towel then turned round and sorted myself out , hearing a creak I knew she had gone ,dressed and went down stairs and had a coffee just as Caroline and Tim came back we exchanged a bit of chat and at that point Lucy came in we all said good morning and chatted as if nothing happened and I disappeared to my trade show as if nothing had occurred just nice wet cock all day .