By making another part of Lindsey wet

Theo was hesitant to listen to Mr. Dinger's request, but like Lindsey he knew that the best way to learn anatomy was a hands-on lesson, and that meant getting naked. Besides, he figured it was only fair to let the poor girl see him nude after the enlightening experience she just gave him. So he obediently followed his teacher's request and pulled his shirt off over his head, then kicked off his shoes and unfastened his pants. With one smooth motion, he pulled down his pants and underwear.

Mr. Dinger noted that like his friend, Theodore's body was nothing spectacular. It looked like he kept himself at least somewhat fit, but not to the point where he had any muscle tone to speak of. And his dick, other than already being at full mast, was nothing special: unshaven, circumcised, and appearing to be about average in size. Despite this however, the look on Lindsey's face was nothing short of awestruck.

"That's what a penis looks like?" the naked girl asked, still leaning on the wall.

"Yes," Mr. Dinger said, "Don't you find it fascinating?"

"Yeah," Lindsey said, her eyes still locked on her friend's erect member, "Is it always like that?"

"No, it's only hard like that when a man is aroused," Mr. Dinger replied, "It's the male version of your pussy getting wet, though their bodies are not as sensitive to touch as a woman's is. When not stimulated the penis is flaccid and smaller."

"I've heard about that once," Lindsey admits, "Can I see what a flaccid penis looks like?"

"You could look it up later, but I don't think Theo here is going to be able to make it go down when you're naked like that," he answered, causing the male student to blush in embarrassment, "After all, he's rather enamored by your body as well, aren't you Theo?"

"Um... y-yeah," Theo stammered, his eyes darting between Lindsey's body and the floor.

"Don't be ashamed to look at her, Theo," Mr. Dinger told him, "After all, this is an anatomy lesson, and you need to see what you are studying to properly learn. Now, notice how Miss Armstrong has been drooling heavily since you pulled your pants down?"

Theo blinked, and he did indeed notice that Lindsey had drool practically pouring out of her mouth, making the bottom of her mouth shiny and wet as it dripped down off of her chin.

"Yeah, whut's uh..." Lindsey started to say, causing herself to drool even more onto her own chest. She wiped the spit away from her mouth and swallowed, then repeated more clearly, "What's wrong with me? I can't stop drooling."

"Don't worry Miss Armstrong, it's a perfectly natural reaction for your body to have," Mr. Dinger assured her, "You're probably just confused about it because you've never seen a penis before, but a woman's saliva production is dramatically increased when they see a penis. They can't help but salivate heavily at the sight of one, especially when it is erect like Theo's is."

"Oh good," Lindsey said, swallowing again in a futile attempt to stop the flow of saliva from her mouth, "That makes me feel a little better. It's still weird though."

"Yeah, why does that happen?" Theo asked the teacher, his eyes locked on Lindsey's wet mouth.

"Excellent question," Mr. Dinger applauded, "The answer is pretty simple when you think about it: women love the taste of a man's penis, and their semen even more so. It's ingrained in their DNA to the point that even the body of a virgin like Miss Armstrong reacts to the sight of one by drooling excessively."

"Is it... does it really taste that good?" Lindsey asked. Even though Mr. Dinger was the teacher, and thus couldn't be wrong, and her mouth was still gushing to the point where it as wet if not wetter than her pussy, she was still skeptical of the claim.

"How about you put it in your mouth and find out?" Mr. Dinger offered, "You're okay with her doing that, right Theo?"

"Y-Yeah," Theo said with a nervous gulp of his own, "It's to help her learn, after all."

"Good man," Mr. Dinger said, giving the young man an affirming slap on the shoulder, "So what do you say, Miss Armstrong? Are you willing to give this dick a taste test?"

Lindsey swallowed another mouthful of spit and nodded. She pushed herself off the wall, then stumbled forward and fell on her knees in front of Theo. Once in front of his erect member, she hesitated for a brief moment, then opened her mouth and wrapped her lips around the head of the cock.

The change in Lindsey's demeanor was almost instantaneous. Her eyes widened and lit up, and before Theo even had time to gasp the naked brunette had slid her mouth down his shaft, engulfing the entire dick as she started sucking with gusto.

"Whoa!" Theo exclaimed in shock.

"How does it feel?" Mr. Dinger asked him.

"Pretty good," the boy admitted, looking down at the tutor on her knees in front of him, "She's really going at it, huh?"

"Well, what do you expect? It's her first time tasting a penis," Dinger replied, "You have to remember, a woman's mouth is just as much of an erogenous zone as the rest of their body, and the taste of dick makes it doubly so. With more experience she'll get better at focusing on pleasuring you as efficiently as possible, but right now she's more than likely too distracted by the taste and her own arousal to care."

"Didn't think about... oh fuck, about that before, but it makes sense," Theo said, watching Lindsey slobber all over his dick. Now that Mr. Dinger pointed it out, he noticed that Lindsey was breathing pretty heavily through her nose, and her lustful moans were causing a surprisingly pleasurable vibration throughout his shaft. What's more, she had one hand between her legs and rapidly fingering her pussy while sucking him off.

"Yes, it does," Mr. Dinger said, "But the good news is that while experienced girls are better at controlling their arousal, a novice like Miss Armstrong here will more than likely orgasm once your semen hits her mouth."

"S-Seriously?" Theo stammered. With the thought of that beautiful sight in his mind, it wasn't long before the boy came, shooting his seed into the eager girl's mouth.

Lindsey squealed in pleasure around Theo's dick as the warm cum hit her tongue. If anything, Mr. Dinger undersold just how good it tasted. Her eyes rolled into the back of her head and her legs shuddered as she experienced a mind-blowing orgasm of her own, spreading her own juices on the carpeted floor beneath her. Despite this though, she still continued sucking on the dick in her mouth, cleaning it off with her mouth as she did her best to get every drop of semen she could out of it and down her throat. It was only when she was sure that she got it all that the young woman slid the deflating member out of her mouth, leaving nothing but a very sloppy trail of saliva behind her.

"Holy... holy crap," she said, taking a moment to catch her breath and wipe her mouth, "That was... that was intense."

"I'll say," Theo muttered, looking rather drained himself.

"Excellent work, both of you!" Mr. Dinger said, clapping his hands together, "Well, I think that's a good place to leave off for today. But perhaps I can give you another lesson in here sometime. What do you say?"

"I'd be up for that," Theo replied as he grabbed his pants and started putting them on.

"Yeah... I think I'd appreciate some more lessons about the male anatomy myself," Lindsey added, wiping her mouth one last time as, now with Theo's cock hidden from sight once more, she had finally stopped drooling. She grabs a box of nearby tissues and starts dabbing at the various fluids remaining on her chest and crotch as best she could.

"Perfect!" Mr. Dinger said, "I'll be sure to come find you two once I can think of another lesson. Just remember what you learned here, and I'm sure you'll do great on your next exam."

And with that, the teacher left the pair in the room to finish getting dressed.

"You know, you did pretty good for your first blowjob," Theo said to his tutor as he slipped his shirt back on over his head.

"Um, thanks," Lindsey replied, now getting her own pants back on, "And... well, your dick tasted amazing."

"Thanks," Theo said, "Um, maybe we could... do it again sometime?"

"Don't get too ahead of yourself," Lindsey said, fastening her bra and grabbing her shirt off the floor, "This was a purely educational experience. Just because I liked how it tasted doesn't mean I'm going to suck your dick whenever you want."

"Yeah, I get it," Theo said. With a devilish grin, he walked up next to Lindsey as she yanked her top down over her chest. Just as she straightened it out, he suddenly blew in her ear just like Mr. Dinger did earlier.

Lindsey let out a gasp, then a loud high-pitched moan as she drenched her panties with her own sudden arousal. Despite the orgasm she just had, she could already tell that it was wet enough down there that it might form at least a small damp spot on the crotch of her jeans.

"Theeeeeooooo!" she exclaimed, though her attempt to admonish him came out sounding way more sexual than she intended.

"Hey, I'm just making sure I picked up on what Mr. Dinger taught me," he said with a laugh.

Lindsey responded with a hard slap on his shoulder, then with a glare said, "Don't ever do that to me again, or I swear on my wet vagina that I'll kick your ass and leave you to sink on your own in anatomy and calculus. And the same goes for what happened in here today. Everything that happened in this room stays in this room, got it?"

"Alright, alright, I got it," Theo said, "Sheesh, sorry."

"You better be," Lindsey muttered, "Ugh, now I have to go to the bathroom and clean this up. Hopefully it doesn't soak into my pants too much on the way there, or I'll really be in trouble."

Theodore followed his tutor out, doing his best to hide the giddy smile on his face. He knew that Lindsey was definitely mad at him now, but it didn't get past him that her vow to kick his ass and leave him on his own wasn't nearly as sincere as she could have made it. As long as he could keep himself from bragging about getting a blowjob to all of his friends, he might have a chance with her after all.

Proud with how his little experiment turned out, Mr. Dinger wondered what he should do next. The group of girls he spotted earlier were still here, as was the mixed gender study group. And of course Mr. Miller, who gave the teacher an awkward glance from behind his desk. Any one of them would benefit from his 'intervention', though he could also just move on to another part of the school and see what kind of mischief he comes up with there. Or even just observe the effects of the changes he already made, though admittedly that would probably just end up with him making more changes anyway.

So many options, so little time...