Note: This story was dynamically reformatted for online reading convenience. Day 2 The Afternoon It was just a few minutes before 2 PM on a beautiful summer afternoon as Mike Kupper walked up the sidewalk to Lisa and Paul's home. The three have been good friends for almost 8 years years but the past two days were an experience that none of them would ever have thought possible. Lisa and Paul have been a happily married couple for 5 years and intimacy with anyone else was out of the question. Mike was their best friend who did many things with them socially, sometimes as a foursome when Mike brought a date along. Lisa loved Paul faithfully and exclusively but her inability to conceive due to Paul's low sperm count introduced an inexplicable and unfathomable new event to the relationship. The couple wanted Mike to impregnate Lisa. None of the threesome, neither Paul nor Lisa nor Mike, wanted to go down this path. Practicality however overruled their objections during many sleepless nights of weighing all the pros and cons. Using Mike's sperm was financially viable, i.e. free. Natural insemination, sex, was thought to be superior to artificial insemination. The woman's body is more receptive to conception during natural intercourse while ovulating instead of artificial insemination. Artificial insemination uses a medical device to place sperm in the womb in an outpatient procedure where the woman certainly would not be aroused. Arousal such as during sex prepares the woman's body to be more receptive to the invading sperm thus increasing the chances of successful conception. Lisa's husband Paul reluctantly agreed that his best friend Mike is the best choice to inseminate his wife naturally. Lisa was not interested in sex with anyone but her husband Paul. Mike loved Lisa more as a good friend than a lover and had no interest in having sex with Lisa. The best decision eventually turned out to be the decision no one wanted to be a part of. Agreement was finally achieved regardless of how unpleasant it was to each individually. Mike will naturally inseminate Lisa when she begins ovulating and then again on the next day when she still may be fertile. Paul chose to not be home while Lisa was being inseminated by Mike and that specific details of the act would not be discussed. Lisa was his wife and he was loath to the idea of another man being intimate with her. Not hearing the details put the whole thing on a clinical rather than erotic basis for him. After successfully having vaginal sex with Lisa yesterday and after an attempt this morning that ended up not being vaginally successful, Mike arrived at Lisa's doorstep for a final attempt. Lisa looked out the window and saw Mike coming up the sidewalk and went to the door to greet him. She opened the door immediately and let him in. Once inside they stood in the foyer of the home and warmly embraced. Mike noticed that Lisa was wearing a soft fluffy terrycloth bath robe that was tied closed. During their embrace he could sense that she wasn't wearing anything under the robe. Wow, she is really ready for this he thought. "Please excuse the robe" Lisa said to him. "After a relaxing bubble bath this morning I didn't feel like fully dressing so I have been lounging around the house this morning like this." Mike made a bold move and stepped forward, untied the sash of the robe and opened it revealing Lisa in head to toe nakedness. He reached into the robe and placed his hands around her waist and drew her to him, pressing her nude body against his. "I sure like this kind of hug" he said to her as he released her and bent down to kiss her breasts, all the while letting his hands roam over her derriere and then around front to caress her pelvis. He then stroked inside of each thigh from her exposed pussy to her kneecaps and back, stopping to linger at the junction of her legs. Mike parted her pubic hair and labia to fondle her exposed slit with a finger. The finger traveled upward to the hard nub at the top of the channel, back down to the entrance of her love tunnel and then up again several times. Lisa could only answer "Ohhh, oh, ummm" before taking his face in her hands and wantonly kissing his lips. "I think we should go upstairs" she managed to whisper. In the bedroom the robe was quickly discarded as Mike shed his clothes. Mike and Lisa resumed their lovemaking on the bed by locking lips and kissing each other passionately. He squeezed and kneaded her soft B cup breasts, pinching each nipple until they were both fully erect. His hand moved between her legs and explored her sex. She was wet and ready. Laying on her side facing Mike, Lisa arched her back to press her pelvis against his thigh. She was in a highly aroused stated as her pelvis and whole lower body thrust towards him, beckoning for the sexual encounter that would quench her flames of desire. She couldn't believe she was this horny and wanted him so much. Perhaps it was the way he first opened her robe and forthrightly began fondling her most intimate lady bits that turned her on so much. Perhaps instead it was the fact that she took him deeply into her throat this morning and wouldn't let him go until she milked every last bit of the creamy seed from his body with her mouth. Or maybe this morning's oral sex didn't afford her the satisfaction of his hard member between her legs and now she needed it. Whatever the reason, she was highly aroused and wanted the feel of a fully erect hot male penis deep inside filling her love cavity. When the time came she could feel the tip of his penis softly opening the delicate folds of flesh, probing for the entrance hidden beneath the pink layers. Slowly it entered her, slowly it entered the now engorged tunnel leading towards her womb. At last Mike was fully inside as their pelvic bones made contact. He remained there a few moments before withdrawing and slowly thrusting forward yet again. She met every thrust by arching her back and pushing her pelvis out, willing him to enter her over and over. The cycle was repeated at an ever more frantic pace until she couldn't take it anymore. As he slammed into her pussy she dug her nails into his shoulders and cried out loudly when the orgasm overwhelmed her. For his part, Mike had reached under her and grabbed her buttocks firmly and passionately, pulling her to him as he slammed his penis into her pussy. Heat radiated from her pelvis to every part of her body. She was overcome with wave after wave of pleasure that wracked her body. She couldn't remember ever having an orgasm this intense or having yelled this loud during intercourse. In her mind she was being pummeled and beaten by the crashing surf. On her bed she was screaming loud screams of passion and joy as the hard cock slammed against her groin releasing a stream of sperm and pleasure. Mike couldn't believe he was coming so hard after being drained only 4 hours earlier by this girl. Sex with her has been like no other. He had to mentally remind himself that she was the wife of his best friend. This was only a service to try to inseminate Lisa. After today they would go back to being good friends, Paul and Lisa as a happily married couple and he as their best friend. When the act was over Mike made sure Lisa remained on her back with her knees up to allow the semen to stay inside and do it's job. He kissed her lightly, squeezed a breast, patted her pussy and then placed a sheet over her to afford some degree of modesty. She was a married woman who deserved a lot of respect. "Thank you Mike" Lisa smiled. "I can't thank you enough for how wonderful you have been to me and how respectfully you have treated me in this intimate situation. I love Paul with all my heart and soul but I will always cherish the intimacy we shared in the past 2 days.", Lisa continued. "Aww, now you're making me blush" replied Mike. "I really didn't want to do this because you guys are my best friends, but after seeing how much you gave of yourself in our private moments I will treasure this experience forever. I know you were reluctant to do this so Thank you for giving yourself so fully and passionately." Mike let himself out of the house and reflected on all that happened. Epilogue The cell phone rang in his pocket a few weeks later. It was both of his friends Paul and Lisa on the line at the same time. They were excitedly chattering away. "It's been confirmed old chap!" Paul blurted out. Lisa continued the conversation "I'm pregnant!". Elated at the news, Mike heartily congratulated the couple. After putting the phone back in his pocket he put his feet up on the desk, stared out the window and reminisced about Paul and Lisa and the whole "natural insemination" procedure. His face was smiling from ear to ear.