Teaching Those Eyes

"I mean we're not making a whole assembly out of this. We can do it with the class, but the bathtub doesn't travel and they're not all going to fit in my bathroom. So what other ideas do you guys have?"

"I have a pool," Catherine suggested. "We could invite the whole class over and do it on Saturday."

"Pool is too big," Mr. G replied. "There won't be a significant rise in water level for you to measure my volume."

"Ok," Catherine said in a resigned voice, "bath tub it is."

"Let's do it Saturday next week, so that gives you some time to think of a better option. Worst case scenario, we can just video tape me getting dunked and then play the tape for the class."

Dunking Mr. G

The girls didn't think of anything better and so they came over to his place next Saturday as planned. Mr. G answered the door barefoot wearing a pair of green running shorts that went down to his knees, an old gray T-shirt and a five o'clock shadow.

Mr. G couldn't help but look the girls up and down when he opened the door. It struck Mr. G how many features the girls had in common, especially the hair. Both were dirty blondes that highlighted. Their eyebrows were several shades darker than their hair. Mary's hair was perfectly straight and went halfway down her back. Catherine's hair was similarly long but it had a bit more volume to it. Mary had a lot of freckles, but they were faint and cute. Catherine had no freckles, well none that could be seen under that layer of makeup. It was a heavy amount that young girls typically wear, but it wasn't a ridiculous amount. It made her face look older. She could easily pass for a college graduate instead of an eighteen year old high school senior. Mary was eighteen as well. In fact their birthdays were only two weeks apart, both born over the summer. Their eyes were the biggest difference between the two. Both had blue eyes and yet Mary's were a light pale blue with a touch of gray while Catherine had those deep blue eyes that pierced into his soul.

Catherine wore a simple white tank top. The material was thin and he could see the outline of her white bra beneath it. Below that was a tiny pair of cutoff jean short shorts where the pockets were longer than the shorts themselves. Her legs were perfectly tanned and smooth, but legs were the one area where Mary had Catherine beat. Mary also wore these tiny short shorts; hers were tiny black spandex shorts. Mary's legs were a shade paler, but not by much. Mary was three inches taller than Catherine so there was more leg to take in. Mary's legs were also muscular while Catherine's were just skinny. Mary was heavily into sports and trained daily while Catherine just ran most weekends to work out. Mary wore a white tank top like Catherine's but over that Mary wore a form fitting baseball jersey. Not a real one, but a tight short-sleeved one sold to female fans. Only the buttons below her bosom were fastened and it seemed unlikely the higher ones would close even if she wanted them too. Both of the girls' tank tops came up high enough to hide their cleavage, but neither was particularly large chested anyways.

Mr. G invited them in and led them up to master bathroom. "See this could fit two people, so it'll definitely work for our purposes," he announced as he turned on the water.

"Wait," said Mary. "Don't we need to measure how much water you put in?"

"Nah that doesn't matter. All that matters is the change in height when I get in. Plus you'll need to know the area of the surface, but you can just measure the edges and treat it as a rectangle." Mr. G grabbed a yardstick that he had earlier placed in the corner. After handing it to Catherine, he couldn't help but take a look at her ass as she bent over to measure the edge of the tub.

"So you need to measure how deep the water is before I'm in it and then keep it in there and record how deep it is when I'm in there. I'll try and stay under as long as I can so hopefully the surface will level enough for you, but I'm not great at holding my breath."

Catherine passed the yardstick on to Mary. "Mary is going to measure this one," she said as she pulled out phone. "I'm going to film this."

Mr. G laughed. "I did agree to that didn't I?"

"Well we were supposed to dunk you in front of the class," Catherine replied with a smile. "This will have to do."

"Alright," he said with a grin. "You get the initial depth?" he asked Mary. She nodded and so he climbed in. Stepping in and then sitting down. He took three deep breaths and then submerged himself. It was very important that his entire body was submerged. It felt like he was underwater for minutes but in reality it was just under thirty seconds. "You get it?" he asked once he was back up and caught his breath.

"Yep," Mary announced. She did some calculations while Mr. G got out and dried himself off. "Six thousand cubic inches," she announced.

"Great," said Mr. G.

"Wait," Catherine said. "Why are they so far off? Didn't we get five thousand from our calculations?"

"They're not going to be exact," Mr. G stated. "Both methods have significant error associated with them."

"So are you going to take off points?" Catherine asked.

"I mean you've already done a lot and you're already in extra credit territory if that's your concern. But I don't have a cap for how much you can earn. Each point will be harder to earn than the previous one, but the more effort you take in improving you accuracy, the more extra credit you'll get."

"I need all the extra credit I can get," Catherine stated.

"Ok, then think about how you can improve your accuracy, but just keep in mind you're never going to get those two numbers to be exact."

"The tub has rounded corners," Mary observed. "So instead of assuming it's a perfect rectangle, I could cut out a triangle out of each corner to better approximate it."

"That's a good idea," Mr. G said.

There was a moment of silence as Mary measured the corners and then updated her calculations. Catherine just stared at the water, thinking of other ways to improve their accuracy. "What about your clothes?"

Mary looked up from her calculations. "You think he's wearing one thousand cubic inches of clothes."

"I don't know, maybe," Catherine said defensively. "Look he said every effort to improve our accuracy helps."

"I did say that," Mr. G said while staring at the water. "Fuck it, let's do it. It's not like there is anything you haven't seen." He ripped off his shirt and threw it on the ground. "Two things. First, you'll need to measure the starting water height again since some water came out of the tub with me when I got out."

"And the second thing?" Catherine asked as Mary got a new initial height. Mr. G just grinned. "Mary we need your talents again," Catherine announced.

"What?" she asked but once she turned away from the water and saw Mr. G without a shirt she knew. "No, I have a boyfriend."

"Mary we went through this last time," Catherine replied.

"Exactly, I did it last time. It's your turn," Mary complained.

"You did it last time because that's your job," Catherine said.

Mary sighed. "You know I do most of the calculations."

"I know another reason you should do it," Catherine said with a smile. Mary's face reddened, her jaw clenched and her eyes stared down Catherine with a fierce intensity. "You want me to tell him what you said yesterday?" Catherine asked.

"Don't you dare," Mary said.

"I won't say a word if you're the one to do it."

Mary wanted to be angry but she couldn't suppress the smile. "You're so bad. Alright, you got me. I'll do it. Just don't videotape this one."

Mary kneeled before Mr. G and lowered his shorts. One of her hands worked the shaft while the other massaged his balls. She watched with amazement as it grew in her hand. Flaccid it was still bigger than her boyfriend's, but not shockingly so. However, unlike her boyfriend's dick, Mr. G's kept on growing.

His cock was halfway towards its full length. It had a fun hour glass shape with the tip and base being more engorged than the middle. She ran her hand over it, fascinated, watching it fill out. Slowly it lost its hourglass shape as it filled out into a solid rod. It grew firmer and harder and yet the skin was still soft to slide her hand across. It was like a steel rod wrapped in silk. She wanted to take to put it inside her, but Catherine interjected to end the moment. "It looks like he's ready."

Mary took her hand off Mr. G's cock and stood up. Grabbing the yardstick again, she dipped it in the water again. Then Mr. G stepped back in. Sitting down first and then he did his three long breaths before leaning back to go under the water.

Between cutting off the corners of the rectangle she used to model the tub and taking off his clothes the volume they calculated this time was significantly lower, but it was still a far cry off the number the calculated with their integrals.

"Maybe we should shave him," Catherine suggested.

Mr. G had his head back above water but was still sitting in the tub. He ran his hand through his wet hair, pushing it back. "You want to cut off my hair?" he said with horror.

"I mean we didn't take it into our calculations."

"You know I still have to go into work on Monday," he said.

"Well we could just shave the rest of your body hair. You actually are quite hairy," Catherine said as she looked his naked body up and down.

"No," said Mary. "We're ready to submit our project."

"Ok then," said Mr. G. "Let me dry off, I'll collect your papers and then you can be on your way." Mary couldn't help but stare intently at his large hard dick flop around as he stepped out of the bathtub. She didn't look away until he finally concealed it by wrapping a blue towel around his waist after he finished drying himself off.

Mr. G had noticed her staring. He excused himself to go get some dry clothes, but he lingered in the hallway for just a moment once he got out of their eye sight.

"What are you doing?" Catherine asked who had also noticed Mary staring.

"We have to get out of here or I'm going to cheat on Ben," Mary responded.

"I need those points," Catherine said.

"When does it end? We've earned enough points."

Mr. G then moved to his bedroom. He hoped the girls would come in while he got changed, but they didn't. He was amazed things had progressed this far without him being the aggressor. He had just been dropping subtle hints, but they were all for it. Mary still is. Catherine is too, albeit she is just here for the extra points, but hey who is he to question her motives if she's willing.

Once dressed, he opened the drawer that contained the panties of past students that he'd slept with. He took a quick deep sniff of the aroma escaping the drawer before closing it and returning to join the girls.

They were waiting for him in the hallway just outside the bathroom. Mary had the papers ready to hand him and then they hurried out before he had any real chance to persuade them otherwise.

He stood there holding their papers for a long time. He didn't read them though. He just stared at them while he cycled through the events with those two girls. First he relived today, then he thought about the rest of the project and then his mind wondered to consider the whole year. He ended up deciding to give them each a 120% on the project. That would jump them each a letter grade, Catherine to a B- and Mary to a B+.

Epilogue

The rest of the year wrapped up without incident. Catherine remained her chipper self in class. She still asked him how his weekend was ever Monday and told him about hers, but she didn't stay anymore. It was the same with Mary. The two of them were on time to photo for the few remaining days in the year.

Mary was different afterwards. She volunteered less often but she was always ready when he called on her for an answer. In fact, her in-class behavior seemed to improve. Yea she volunteered less, but she was way more focused than she was before. It's like she hung on to every word he said and watched every movement he made from that point on.

Mr. G did his part to act normal, but damn it was hard. He so badly wanted to fuck them. He did let an innuendo slip once, but it didn't land. It was kind of the worst of both worlds where he didn't get the full experience he wanted with them but the friendship air was gone. Maybe it was just him, after all Catherine seemed to be acting exactly the same, but it just wasn't the same. Fortunately there wasn't long left in the school year.

At graduation he couldn't help but wonder what they wore under those robes, but he didn't get a chance to find out. He had resigned it as a missed opportunity and he was ok with that. It's too risky chancing down every single opportunity. Just one student has to blab and he'd lose everything.