We were out as a couple drinking in the local pubs, Donna with the girls me with the lads. During the evening I was aware of a friend of Donna's who was also out with her brother and a number of his male and female friends. As the evening wore on I could see Donna flirting with Nigel one of the blokes in his late 30's. Before I go on I should describe Donna. She is a 37 year old girl who is very attractive with long blonde hair, nice tight ass and a tight shaven pussy to die for. As last orders rang out and the pub started to clear, I could see that Donna's friend was leaving with all of her friends to carry on the party at her house. Not finished with my beer I said I would follow shortly and let Donna leave with the party. About 10 minutes or so after leaving the pub, I made the short walk home and as I turned the corner of the road I could see a couple of figures half way up opposite our house kissing. It was Donna and Nigel. Whilst pissed off I became very aroused and rather than shouting up the road I continued to watch as they went inside to our neighbours house. The neighbour backs onto a park and therefore I decided to go into the park and see if I could cattch her out in the garden. I took my cock out and hid behind a tree as I could see a small number of people milling in the back garden. At the bottom of the garden was a trampoline and after 10 minutes or so, Donna, Nigel and another guy came to the bottom of the garden to fool around on the trampoline. I could see the guys holding Donna's arse and hands as they guided her on, and then followed her on and played around much to her pleasure. Both guys kept touching Donna to hold her steady even though this was not required. They went back towards the house after much touchy feely, and after no activity for another half hour, I walked back home. As I approached our house I saw the lights on downstairs, so rather than go in I sneaked round the back into darkness and looked in through the kitchen window. Donna was tongue kising Nigel whilst his mate pulled off her jeans to reveal a tiny pair of white thongs that he gently peeled over her tanned slender hips. As Nigel was pulling Donna he seemed keen to have the first feel of her pussy, and with a gentle feel he rubbed her cute pussy lips before slipping a finger in her slipper tight hole. His mate was now pulling her top off and gently unclasping her bra to get a feel of her small but firm tits. He rolled the nipples gently and sucked them in his mouth whilst Nigel continued to kiss her and rub her fanny lips. We have a sofa in the conservatory and with Donna naked they moved in there where the guys removed trousers and let Donna stroke each cock. Nigel moved Donna onto her back on the sofa and proceeded to lick her cunt out, whilst his mate stuffed his cock in her mouth. With only a thin window between us, I could her her moaning for Nigel to stick his cock in. His cock was ample and without protection he buried his cock in her which made her squeel. He demanded she talked like a slut and say it was better than any cock she had ever had, to which she said it was. After minutes of Nigel fucking her she demanded to be roasted and both guys then took it in turns to fuck her arse and pussy. Nigel came in her pussy and on her stomach whilst his mate shot his load in her throat and face. They made themselves decent and returned across the road to the party, and behaved as if nothing happened when I eventually turned up. I know she is seeing Nigel now behind my back but the thought of her getting fucked hard and like a silly little slut is a great turn on. I just wish I could see it all.