I had her fetch the bone we had used for carving runes in the dirt, and quickly began to draft up some floor plans, for lack of a better term, on the floor by Vera's room, while explaining to Vera what exactly I wanted to do. I couldn't use the topaz stone without Jewel present, and I wouldn't either. My formula magic knowledge was at the entry-into-intermediate level, but Vera has already learned the basics of land magic formulas enough to flatten walls and floors. It was time consuming to have to make magic formulas to affect everything, but the sapphire stone came with a bonus. It's essentially a water focus.
"Vera. Want to see if you can use some force magic?"
That interested her immensely from how excited she looked.
I explained what it was that she should be feeling by circulating the mana in her body while holding the sapphire stone. It's not unusual to not be able to use force magic right away. That's why there are two disciplines for magic in this world; Force magic and Formulaic magic.
Usually a magician is stronger in one discipline over the other, it's… like being right handed or left handed. Sure there are ambidextrous people who can use both fairly well, and those who teach themselves, the same goes for magicians, with the tier ones who like to train extensively to be good in both disciplines, but they aren't around my age by the time they start to care, they are far older.
I had tasked her with focusing on trying to manipulate a bit of water I purposely spilled on the table. I let her alone to focus on her task, as it's pretty straightforward how to use Force magic. I explained channeling her mana to the stone in her hand, and then from there to her other hand and getting the feel for it. I wasn't expecting much progress. Hell, I couldn't use magic the first time I tried, and I was born into a good bloodline adept with mana manipulation in this life.
Vera had been puzzling about what to do on her own, before she came over to me and sat on my lap, taking me inside of her.
"Mana." She voiced, in her oversimplified way of speaking, which usually required me to guess at what she was thinking.
"You want me to cycle mana through your body?" I asked, to which she replied with a nod.
If she thought it would help her figure something out, that's fine. She was just keeping me inside of her, and wasn't even wiggling her hips like she usually would. I was injecting mana into her both through my dick and with my hands which she had me put on her belly.
She had put a hand on the wall next to us to steady herself and I had sent a pulse of my mana through her body with intent so she understood what her own mana was supposed to do in regards to force magic.
"Again."
I did as she asked, and quite a few times she kept saying "again."
On the fifth or sixth time, it happened.
KACHOOOOOM!
She had sent out a strong burst of mana from her hand which blew a fairly large hole in the cavern wall she was touching. I had no doubt someone was going to come rushing in here in a moment or two, and then there would be a lot of explaining to do.
With exceptional luck, the first on the scene was Jewel, armed with her knife.
I think she knew something was up when she saw us covered in dirt.
Thankfully Vera had her sapphire in hand and there was enough time for us to separate our bodies and for me to explain things to Jewel before Prima and Tree-chopper showed up a few moments later.
"What do?" Prima interrogated, staring at the hole in the wall, and to Vera and I.
"A particularly troublesome section of the wall caved in. I didn't mean to worry anyone. Don't worry, Jewel was here keeping an eye on me." I mostly-lied.
Prima sighed.
"Stupid Husband." She complained and then turned around to leave. Tree-chopper the lazy guard waved at me and I did the same.
Jewel however…
I had to explain without any bullshit what had actually happened after the other two left.
"So, Stu–Vera use boom magic?"
"No. Maybe, but I don't think so. I was pushing my mana into her body so she could figure out how to use the sapphire stone as a focus so that she could do what I do with the topaz stone, only I think I put a little too much inside and it had to come out like… boom?"
Jewel glared at me. "Husband. Not. Do. Again!"
"I promise! It was just an experiment to see if she could. Wouldn't it be nice if the both of us could make your cave-hole even nicer in the future?"
Jewel squinted her eyes at me. I do think she sensed the bullshit behind those words, but she let it go. Of course, I had to pay the piper for the disruption. Not that I mind fucking Jewel at all, she has great tits to squeeze, and she really gets into it, wanting it rough.
Whew!
My dick is sore.
Is it possible to fuck too much?
With Jewel gone and it just being Vera and I, she pointed at her stomach.
"Know."
"You know how to use force magic?"
She nodded, and then shook her head.
"So… you can, or you can't?"
She took my hand and put it on her belly.
"Know."
"Uh… are you telling me… the strong one?"
She nodded.
"Know."
She took the bone used for drawing runes from me and began to write flattening runes on the wall, activating them as soon as she finished each one.
In no time at all, a second bedroom was created, adjacent to hers.
"Is that for me to sleep in?" I asked. Vera only shrugged. Was it just made then to cover up for the hole she blew into the wall?
Sadly no further answers were forthcoming. I felt like this was the perfect time to take a breather, so I asked if Vera would go get her sister so I could go get some fresh air and let whatever leftover dust was in the air, settle.