Unlike so many women after menopause, my 56-year old wife's sex drive dramatically increased rather than decreased, so much so that we have sex almost every day. The only accommodation she needs is lots of personal lubrication beforehand. I love it since I get more sex now than ever before as she's almost insatiable and, with my permission, has branched out to having other men. Most weekend evenings we cruise our favorite pubs and hotel bars looking for men to bring to ours for threesomes with me having her after he's finished with her. This new aspect of our sex lives is highly erotic for me as I love watching her being taken by another man and crying out her orgasms. And then I love slipping my cock into her cum filled pussy for 'sloppy seconds'. Since she frequently likes it more than once a day and I'm still away at work during the week, we've agreed she can have one off lovers those days so long as she meets me at the door when I return home from work with a pussy full of cum for me to fuck or, if he is still there, I can have her after he leaves. This means that most days I'm horny from anticipation when I get home knowing there's a good chance I'll be getting 'sloppy seconds'. And, if not, I'll probably have her before the evening is over. Yesterday was a good example. There was a strange car parked out front and my cock instantly became hard in anticipation as I slipped my key into the door lock and pushed it inward. I immediately heard the sounds of my wife and a man rapidly climbing to a climax. The drapes of the lounge were drawn, but I could see in the dim light they were fucking in the middle of the floor atop the several sheepskin throw rugs we keep there for that specific purpose since we like doing it in the lounge almost as much as in bed. He was a big solidly built guy in his thirties and lay naked between her drawn up legs earnestly thrusting his cock up her. Rucked up about her tummy was her favorite red 'fuck me' dress, her nicely shaped ample breasts were bare and he was kissing her nipples as he fucked her. She was out of her mind with passion, her hips writhing beneath him, her hands urgently moving up and down his head and back. She was moaning and panting loudly as her head flailed from side to side, her eyes tightly shut. It was obvious she was very close to coming, but it seemed he was in no hurry to push her over the edge as his cock thrusts, although they were deep and powerful, were not hurried like they would be if he also was close to coming. She loves being pushed to the plateau just below a climax and fucking there for a considerable time before being suddenly shoved over the edge by rapid pounding. I got the impression they had been going at it for quite a while and this was not going to be her first orgasm of the afternoon. His deep and deliberate strokes were driving her crazy with need for sexual release because her moaning had now turned into loud gasps of 'fuck me' … 'make me come' … 'I need it now'. Hearing this, I rapidly got out of my clothes in the hope he would come with her so I could take over and fuck her myself. Almost in answer to my silent request, he suddenly started rapidly pounding his cock into her in a climatic fucking frenzy. She went over edge and, as she wailed out her climax, she swung her legs over his waist and locked them at the ankles. At the same time she dug her nails into the muscles of his upper back as she violently fucked him back with jerking hips. She was coming with loud gasps of intense release at the same time he was grunting out his own climax, shooting his cum up her with deep thrusts of his hips slamming against her groin. I found out later I was witnessing what was probably her sixth intense climax in a half hour session. And this was after he had given her several orgasms with his mouth and fingers during their extended foreplay. I watched them as I absently wanked my cock a bit for temporary relief until I could replace him between her legs. When her long orgasm finally subsided, I was amazed how erotic she looked as she slowly sagged beneath him, looking totally fucked out. When he finally rolled off, she lay there with her legs splayed open sluttishly displaying her lightly haired covered groin. It was wet with either perspiration or cum, probably a mixture of both, and a lava-like flow of thick cum was slowly leaking out of her wide open pussy. I was so horny I couldn't wait for him to move away from her side, so I just lowered myself between those lovely legs and, ignoring his presence right next to her, shoved my cock up her as I slid my arms under her shoulders and started to thrust hard and deep. I was so horny from watching them I couldn't help myself and fucked her hard and fast, knowing I needed to come quickly. As I fucked deep into her, she opened her eyes, slid her hands around my back, and pulled her knees back to help me go deeper. She raised her mouth to mine and started kissing me deeply. As I felt her fucking me back, I whispered to her, "Can you come again, this time with me? I'd like you to come with me." She nodded, then resumed kissing me. I felt her arms tighten about me and her hips start to buck hard into me. By this time, I just needed to come. I felt my cum rapidly rising, then rush up my shaft. I bellowed out my climax as my cock spurted several times, adding my cum to his in her drenched and swollen pussy. I continued thrusting, trying to prolong the fabulous feeling in my groin as my orgasm overtook me. When I finally collapsed onto her, I kissed her as I ran my fingers through her hair and thanked her. She told me she had only a tiny come, but that it felt good to feel me come in her. As we both came down, she apologized for only having a tiny one with me because she had already had come about six comes with him and was finished for a while. We cuddled entangled in each other's arms and legs as he went to the ensuite and then got dressed. As he was leaving, my cock got hard again and we had a leisurely fuck. Neither of us came, but it was still very satisfying to just languidly slid my cock in and out, feeling the slipperiness of her pussy wrapped around my cock. We finally got up, had a simple dinner, and talked at length sitting in the lounge in our underwear between kisses and caresses. We then went to bed and slept for several hours, then we woke up and fucked again, both of us probably imagining I was her afternoon lover.