This story is 100% true and it involves my 40 year old wife Karen.We recently moved into a larger house with a big garden and as Karen has greenfingers the garden was a key decider in buying the place, especially as it had a large greenhouse type potting shed to enable her to follow her daytime/weekend hobby.Karen is an attractive brunette,a little bit fleshy i suppose,and she has an enormous pair of breasts (36H). We had met Arthur our next door neighbour when we first moved in,he is a nice old boy of 70 years old and very friendly,i thought nothing of it when a few times recently i have arrived home early for work to find him helping Karen in the potting shed with her plants. A couple of weeks ago it had been very warm and Karen was wearing a pair of tight white shorts and a vest that revealled her deep cleavage,'You'll give poor old Arthur a heart attack' i joked as she came back into the house as Arthur gave us a cheery wave as he left our back gate.'I think that's why he comes over' laughed Karen. The idea that the old goat was letching over my lovely wife excited me greatly and i told Karen so,i was suprised at the naughty smirk she gave me and later that night we had great sex,it seems that Karen has been getting herself hot and bothered teasing old Arthur from what she told me,and we agreed that perhaps we could have some fun taking it a little further and Karen giving me the details. It was a nice day one day last week when i arrived home from work,Karen was dressed yet again in shorts and vest and looked a little flushed.'Arthur's been helping me out again' she grinned. I could not wait to hear the details and Karen teased me all night until bedtime saying 'nothing happened'.However in bed that night Karen confessed all 'What a dirty old man that Arthur is' she chirped. Karen told me that she had bent over in her tight shorts to give Arthur 'a thrill' and that he'd put his hand on her bottom and given it a good grope and two hard spanks.Karen turned over on the bed, lifted her nightie and there sure enough i saw two large red handprints on her big wobbly buttocks. 'What did you say?' i asked 'Ouch!' she replied. The old boy had realised he was being teased it seems and had taken the initiative. Karen told me that he also fondled her bottom at several other opportunities that afternoon,But best of all was his joke regarding the 'two prize melons' that Karen had 'grown' it was of course a reference to Karens big heavy udders,Karen told me she had blushed bright red especially as he had stood behind her and cupped their weight,then put his hands up her vest and fondled them through her bra. Karen being quite shy said nothing and this encouraged him to lift her top and unclip her bra at the back allowing her big ones to swing free,Arthur groped and played with Karens big tits and nipples for ages as she stood blushing and making little protests while loving every minute.The whole naughty thing has been a huge turn on,and we hope to create further opportunities for groping fun for the dirty old man next door.