Rachel said, "You have to if you want to keep a man happy. Fact of life."
Shelley agreed to come again, two nights later. Ross told Rachel that he dearly wanted to fuck Shelley's pussy again. They formed a plan to make that happen. Once in the bedroom, Ross said to Shelley, "Just lie back, with your head on a pillow, raise your knees up, and spread your legs a little. Do you have orgasms from masturbating?"
Shelley said, barely audibly, "Yes."
Ross said, "Just wait. After you have an orgasm, I want to make love to you again, Shelley."
"Um, I guess so."
That was all the approval Ross needed. He dove into her muff, and sent her nearly into orbit in mere seconds. She tossed her head around, eyes bugging out, crying out incoherently. Ross grabbed her thighs to prevent her from dislodging him as she flailed about. After a few minutes, Shelley appeared to go into spasms, signaling her orgasm. After it ended, and she recovered sufficiently to speak, she said, "That's it. That's enough."
Ross swiftly lubed his erection, and mounted her before she could object. He tried to enter her as gently has he had the first time. She was more vocal this time, "Oh, no, don't. Professor Geller! No!" It was too late for no. He was already entering her, and nothing could stop him from spearing her and finishing. After he was most of the way in, she stopped protesting and just rode it out as best she could.
Ross churned his wang in Shelley's pussy for about a minute before coming explosively. He rocked her with his concluding thrusts. He pulled out, and chose to call it a night.
The following week, they scheduled Shelley to come Friday night, so that Ross would have plenty of time for what Rachel hoped would be his last meeting with her. First, they revisited Shelley's blowjob technique. It had improved enough that Ross came in Shelley's mouth. She was still poor at giving head, and she gagged and coughed up a lot of his sperm, but at least Ross went on record as her first.
While Shelley was in the bathroom, Ross said, "I want to complete this, Rachel. I want to be the first to have her in every way. She will have nothing new to offer any man, ever."
Since it was Friday night, Shelley drank liberally as they ate dinner. The plan was to get her dead drunk, and buttfuck her. That would be it for Ross and Shelley, as lovers. Rachel wanted this to end far more than Ross did. Rachel poured the booze into Shelley as fast as Shelley would swallow it. When Shelley had difficulty sitting upright, Ross and Rachel helped her into the bedroom. They removed her robe, lay her on her stomach on the bed, and let her rest. They slipped two pillows under her pelvis, and spread her legs a little.
Ross and Rachel had planned this carefully. The idea was to make it so quick and confusing that Ross could get his shot off before Shelley had time to object. It would be a challenge, because he had already come once that night. Ross lubricated himself, and delicately poured oil down Shelley's butt crack. Rachel sat on the bed, holding Shelley by the shoulders and talking to her. Rachel was tasked with distracting Shelley, and restraining her if she attempted to escape.
Rachel nodded to Ross. He spread her butt cheeks with his hands, put the tip of his dick into her anus, and pushed. Once established inside, he fell forward onto his outstretched arms, and put his weight behind his penetrating rod. Shelley looked about quickly, and asked, "What's going on?"
Rachel held Shelley's shoulders firmly, and said, "It's like a massage, Shelley. Ross is massaging you. It will feel nice. Just relax, dear."
Ross was all the way inside her ass, now. Nothing could dislodge him. He pounded her ass for a few minutes and gushed cum as a grand finale. He carefully pulled out. When Rachel and Ross released Shelley, she was confused, and staggered into the bathroom. Everything was normal when she emerged. Ross and Rachel were sipping wine in the living room. They invited Shelley to join them for dessert.
Shelley slumped into her seat. The shock of what Ross had done had sobered her up considerably. They poured coffee for her. She picked at her dessert. Finally, she said, "I'm going home," and went into the bedroom to dress.
When she came out, Shelley said, "I think this is over, guys. Bye." She wearily headed for the door. Ross was concerned that Shelley could not make it home safely. Rachel said, "Shelley, we'll go downstairs with you, and get you a cab, so you get home safe, okay?"
As the cab disappeared into the night, Ross said, "The perfect crime."