I live alone with my 15 year old daughter who often has her best mate stay over. My daughter is steady dating but also appears to be very 'close' to her girlfriend, they often hug and sit watching tv cuddled up which gives me an instant and constant boner. A few times I have wanked myself off with her friends underwear fantasising about the pair of them touching each other.
The weekend just gone her friend stayed over and there was quite an electric air between them. Saturday evening they did some cooking and messed about, when I went into the kitchen I almost shot my load, they were both wearing old baggy t shirts and my daughter definately didn't have a bra on, her nipples were huge poking out like bullets and as she moved about they wobbled, she stood behind her mate and pinched her bum, I had to leave. Later that evening they were watching tv and play fighting and tickling each other, my daughter ended up lying on her front to watch the programme and her mate sat on her astride her bum, I had a glorious view of her panties stretched across her puss and for the next hour my cock was pumping and twitching in my pants.
They went to bed and were sleeping together in the ground floor guest room and as I sat there my mind raced as to what they might be up to. I snuck out the house and round the back, the blind was lowered part ways down, I peeked in and could make out two shapes beneath the duvet as the bed side light was still on, I could make out the y shape of a pair of spread legs and then as I peered in I could definately make out a regular pumping movement between the legs. I undid my zip and sprung my cock free almost coming on the spot and I dared not touch myself in case I jizzed. I watched some more and now I could make out an arm movement as the pumping action increased while these horny teens wanked each other off, then the movement stopped and the two shapes hugged each other, next the duvet slid off and it was my daughter who was fingering her pal and I shot huge wads of hot sperm against the wall. The next day when they had gone into town I checked out her room and noticed some photos of her mate stuck to the inside of her bedside cupboard, the photos were printed from a home pc and were shots of her friend from the neck down just wearing her panties and bra and were quite sexy so for the next few minutes I stroked myself off with some soiled panties looking at the pics.