My wife keeps moaning that i don't shag her enough; it's not that she's unattractive, in fact far from it, she's 52, looks younger, nice pair of tits, size 12ish and very good looking, it's just got a bit predictable and boring. She's been on about that if things don't change then she might be tempted as she knows men still look at her,even younger men.I always thought she was joking.........untill last week. She works at a school and had to go in at half term to have some building contractors in to quote on a job, i was on holiday as well and she said she'd only be about an hour so i expected her back around midday; by two o'clock she still hadn't come home and i was getting a bit worried. I drove up to the school as i couldn't get her on her mobile; i was relieved when i saw her car was there and so was the van belonging to the contractors.I guessed she was in her office sorting the admin stuff out, part of that was right. As i got nearere her office i could see that the blinds were shut but there was a gap and i just had a quick look through as i didn't want to barge in unexpected. I couldn't believe what i saw; my wife was there alright, so were two young blokes who must have been in their late twenties at the most; she was stood up snogging one whilst the other was behind her and was undoing the zip on her skirt; the one she was kissing had unbuttoned her blouse and slipped it off her shoulders to reveal the black lacy bra she had on; his hands started fondling her tits through the material and the other one had now slipped her skirt doen her legs, she was wearing hold up stockings and black lace french knickers which brought a smile to the one behind;s face. Her bra was unhooked and her lovely tits swung into view, the man in front was squeezing her nipples and they soon became as hard as rock and stood out, he started to suck them quite aggressively. She suddenly pulled away from both of them and dropped to her knees in front of both of them, she unzipped their jeans and managed to get their cocks out which by now were fairly huge and throbbing; she started sucking one after another in turn, then wanking them both off till they shot their spunk across her face and tits; she rubbed it in all over her tits and then stood up and turned round and bent over her desk. "Fuck me then boys" i heard her say, " one after anothetr till you come again." They didn't need asking twice, straight away one took his turn and got his cock hard again, he slipped it into her and thrusted away till it was obvious he'd come again, she hadn't so the other one had his go; i knew by the way she shuddered that she'd had her orgasm but it wasn't over yet; the first one got his cock in his hand again and now started rubbing her arse, lubing it up with the come from the two of them; she'd never let me do that and i was amazed that she seemed to be loving it as his tool dissapeared up her brown arse hole.He was pumping into her like mad, the other one had gone round to the front and she was gobbling on his huge cock for all she was worth, the three of them almost came together and then when they'd finished she calmly got dressed and sat down at her desk to fill out their paperwork as if nothing had happened. I was in a state of shock and slipped off and came back home; she arrived about an hour later looking a tad flushed, when i asked her why she was so late she just said "something came up." Yeah, and i knew exactly what, two cocks, that;s what. I confessed to her i'd seen what had happened and she said she'd told me she might be tempted; since then she has started to go off and fuck other men as well and i'm helpless to stop her as she seems to have the taste for as much cock as she can get.