Penny could hear the shouting from across the hall, mostly from Amy.
"What's Sheldon done now? Man, she's really pissed!"
Penny thought to herself. Never one to miss a chance for gossip material, Penny stood closer to her own door to see if she could hear what all the fuss was about. But, alas, she could only hear shouting, not the words that were being shouted. Still she thought to herself,
"I can't wait to tell Bernadette!"
Eventually the shouting stopped. Through her peephole she saw Sheldon leaving the apartment and walking towards her own.
Knock-knock-knock. "Penny and Leonard." Knock-knock-knock. "Penny and Leonard." Knock-knock-knock. "Penny and Leonard."
She opened the door. "Hi, Sheldon. Leonard's not here. Is there anything I can help you with."
"I suppose," he replied with a long face. "May I come in?"
"Of course."
Sheldon went straight to his spot on the couch and slumped into it, putting his elbow on the arm of the couch and resting his head in his hand. Penny sat down next to him.
"What's wrong, Sheldon?"
"Amy's mad at me."
"Yeah, I heard. I'm sorry, sweetie," she replied, rubbing her hand tenderly on his shoulder. "Why is she mad?"
"I'm not sure." He paused. "I think she's upset because I touched another woman's breasts."
"What?! Sheldon!"
"Interesting. That's the exact reaction Amy had."
"Why were touching another woman's breasts?"
"Well, some colleagues and I were talking about the amazing advances that have been made in the plastic surgery field and how they could take a male and turn him into a female without there being a hint that woman was once a male." He paused. "One of the new female professors mentioned that she had recently had her breasts augmented and wondered if I would give her new breasts an evaluation in private and offer an opinion based strictly on science and physics."
"Sheldon!"
"I don't understand. It was strictly for scientific purposes."
"Did she take off her shirt and bra?"
"No." He paused. "She took off her shirt. She wasn't wearing a bra."
"Sheldon!"
"Help me understand, Penny. What did I do wrong?"
"Sheldon, when you're in a relationship with somebody, there are boundaries that each person in that relationship doesn't cross. Touching another woman's breasts, and other private parts, is a pretty big line most women get upset about her mate crossing."
"Penny, I don't understand all these rules in relationships. It's one of the few things I'm not good at. And now I'm afraid I've ruined things with Amy," he said in a forlorn voice.
"I know, sweetie, I know," she said as she rested her head in his chest, her hand now wrapped around his waist. Sheldon uncharacteristically wrapped his right arm around Penny, still resting his head with his left hand. "Relationships are hard. You guys will figure it out. It just takes time."
"But she's so mad. She told me to get out."
"I'll talk to her. She'll get over it. You two odd ducks are meant to be with each other."
"Thank you, Penny."
They stayed cuddled on the couch for a few moments. Then Penny glanced down and could see a bulge had grown in Sheldon's pants.
"Sheldon? Sheldon, are you getting a hard on?"
"A 'hard on'? What's a hard on?"
"Your penis. Is your penis getting stiff?" She ran her hand down and began to rub his growing bulge.
"Penny! Why are you rubbing my groin?!"
"You do have a hard on! Is this making you horny?"
"Horny?"
"Sexually aroused, Sheldon."
"Well, let's see. I like us sitting like this. Your scent is quite intoxicating. Your skin is so soft where ever I touch it. My heart rate and breathing patterns are higher than normal. Yes, all signs point to being sexually aroused."
"God, Sheldon. Only you could make being horny sound like a trip to the doctor."
"Do you think I need to see a doctor?!"
"No, Sheldon, you need a release," she said as she undid his belt buckle and the button on his pants.
"Penny?! What are you doing?!"
"I want to see what you're hiding in here, Sheldon," she said as she unzipped his pants.
"But Penny, you said couples shouldn't touch other people's private parts."
"People in relationships also need to find their own boundaries, boundaries that work for them. Not every couple will have the same boundaries. This is a boundary Leonard lets me cross from time to time. And this is one of those times."
"Well, okay," he said while shrugging his shoulders.
Penny was stroking his cock through his tighty whities. She looked up at him. "Tell you what, Sheldon. Let's consider this an experiment. If you like the results, I'll teach Amy. If not, then we throw the results away and never speak of it again."
"Oooooooo, an experiment where I'm the test subject?! Sounds like fun!"
"Trust me, Sheldon, it will be fun," she said with a sly grin.
"So what's the experiment?"
"I'm going to give you a blow job, Sheldon."
"A 'blow job'? What's that? Will it hurt?"
"Not if I do it right." She got off the couch and got on her knees between his legs. She tugged on his waistband and he lifted his butt out of his spot so she could pull them down. As she pulled down she could see his pole trying to pop free. And then...
His cock sprang from his pants like a jack-in-the-box, firm and straight. It matched his body build, long and lean, probably 10 inches long was her guess.
"Holy crap on a cracker, Sheldon!" She grabbed its base and began to slowly stroke it.
"What? What?! Is something wrong?!"
"Absolutely not! You have a beautiful cock, Sheldon. Now I see why Amy puts up with your shit."
"Cock?"
"Penis, Sheldon, penis." She moved closer and lightly kissed the head of his cock, then ran her tongue around its edge.
"Penny! What are you doing?! Do you know how unsanitary that is?!"
"Sheldon, knowing you, this is the cleanest thing I'll have in my mouth all day." She continued to stroke it.
"Well, that's true. I do have excellent hygiene. And you do put some nasty things in your mouth."
Penny shot him a look. "Sheldon, stop talking. Try to relax and enjoy this."
"Relax and enjoy. Yes. I'll do my best in the name of science." Penny rolled her eyes as Sheldon leaned back into the couch and closed his eyes.
She stared at the pole in front of her then took it into her mouth. Sheldon jumped a little and giggled. "That tickled a little," he said with a childish grin, eyes still closed.
She removed him from her mouth. "Sheldon..."
"Yes, yes, stop talking, relax and enjoy. Yes. I'm sorry. Please continue with your experiment."
"Keep your eyes closed, Sheldon."
"Yes, yes, of course."
Penny stood and peeled off her clothes, throwing them off to the side. Unbeknownst to Sheldon, she was now standing completely naked in front of him. She massaged her breasts with her own hands. Her pussy had grown moist knowing that she was about to give Dr. Sheldon Cooper his first blow job.
She knelt down between his legs again. "Ok Sheldon, we're going to try this again."
"Yes, please proceed."
She grabbed the base of his cock once again and began to stroke it. She raised her face above it and slowly lowered it down, taking its length inside her mouth. Sheldon gave a slight moan. Her mouth felt warm and moist around him. Her lips were velvety soft.
Her head bobbed up and down on his cock, her right hand stroking it, matching the rhythm of her head. With each bob she was able to take more and more of his 10 inches inside her, eventually relaxing her throat muscles enough to completely deep throat him, burying her nose into his stomach on each down stroke.
While Penny was burying her nose in Sheldon's belly on the down stroke, her left hand was burying two fingers into her own soaking wet slit. She couldn't believe how turned on she was by having Sheldon's cock in her mouth. She's had many cocks in her mouth before but this was different. Maybe it was because of her relationship with both Sheldon and Amy. Who knows? All she knew at the moment was she was fucking turned on.
Sheldon was feeling things he'd never felt, too. Sure, he and Amy have had sex. But that's completely different than what he was feeling now. Sex with Amy was very mechanical, very stiff. And he liked it that way. At least he thought he did. What's happening now is very fluid, with no sense of structure. Quite against his nature. But, much to his surprise, he was enjoying this quite a lot.
Penny could feel Sheldon's cock throb inside her throat. She knew he was close. A combination of precum and saliva were dripping off her chin and onto her tits.
"Penny...Penny...Penny! I feel strange! I feel like I'm going to burst!"
She released him from her mouth with a pop and began to stroke his cock with firm, fast strokes. "That's good, Sheldon, that's good. Don't try to stop it. Keep your eyes closed, sweetie, and let it go."
His fingers dug into the couch, his back arched, his muscles tightened. "Penny! Penny! Penny! Ohhhhhhhhhhhh!"
Cum shot out of him like water from a fire hose while she continued to stroke him with both hands! The first rope shot straight over the bridge of her nose and down the part in her beautiful blonde hair. A second blast hit her chin and splattered across and down her neck. A third volley hit just to the side of her sternum and streaked down across the top of her breast. She finally took him back into her mouth and stroked his still throbbing shaft until she felt like she had sucked his balls dry, at least for the time being.
She released him from her mouth and tenderly stroked his softening cock. Sheldon collapsed into the couch.
"Sweetie, you can open your eyes now."
Sheldon slowly opened his eyes and was horrified at what he saw.
"Penny! What happened to you?! What do you have all over you?! Did I explode on you?! Oh dear! Oh dear! What have I done?!"
Penny caressed his thigh. "Sweetie! Sweetie. It's okay. I wanted you to explode on me. I like this. It's okay." She ran her fingers down her forehead and across her nose, scooping cum as she went. She brought them across the tip of her nose and stuck her cum covered fingers into her mouth. "Mmmmmmmm," she purred.
"What...what is that all over your face and...hey, you're naked!"
Penny laughed. "Yes, I'm naked, Sheldon. And this is cum, your cum. It shot out of your cock and all over me."
"And you like that?"
