Commence Reverse Charge
"You really don't need to eat anything?"
The next morning, after they'd woken, Topaz was putting together a simple breakfast when she asked the question, worry threading her voice. He answered with a nod.
A strand slipped from his body and reached out to knead the ass of Topaz as she cooked. Amazingly, after a full night's rest—or perhaps he'd simply grown—he could now sprout multiple tentacles from his chubby, one-piece body. The work was still clumsy, but he was experimenting: splitting a strand's tip into finger-like digits, morphing it this way and that, testing the range of what he could do. He squeezed.
"Ahn♥ The second you grow more tentacles, the first thing you do is sexually harass me♥"
Her words said one thing; her voice, all breathy and melting, said another. She even pushed her ass back a little, angling it so he'd have an easier time groping.
"Right, your food is my mana anyway♥ Hurry up and eat so we can do something that feels good again?"
Apparently she wanted to finish eating so they could get straight to the fun part. She planted a kiss on his head, whipped through the rest of her cooking, vacuumed down the finished pasta, ducked out for a quick wash-up, and came back to flop onto the bed.
"Okay. You can do whatever you want~♥"
She fluttered the thing she called pajamas—a baby-doll so sheer and outrageously slutty it left nothing to the imagination—and beckoned him in.
He went for the sting first.
"Ah♥ Y-you're starting with the prickly one~♥"
He still resented not getting a taste of her pussy yesterday, and only sampling one breast's worth of milk had been almost as bad. So the first thing he did was extrude a hypodermic needle from a tentacle strand. In a single day he'd more or less figured out how to work the thing. The needle was shorter and thinner than yesterday's, and he'd coated the surface with a light dose of aphrodisiac to take the edge off the pain.
Psshk!
"Hyaah! Nngh?! I-it's different from yesterday… it doesn't hurt♥"
Keheheh. Seeing her melt like that, all that effort extracting the stuff was worth it.
"Nnh♥ Hah… hyaah… i-it feels weird… my chest♥"
Yesterday the mana had leaked out thin and watery, like actual milk. After a day's worth of refining the drug, what came out now was thick as heavy cream. That thickness was the whole charm—it couldn't spray freely, just pulsed out in clogged, heavy surges, like something stuck in the pipe. It was like a cock right on the edge of coming, stimulation cut off at the last second: her breasts trembled, desperate to unload. Insanely hot.
"Nnh, milk… my milk♥ S-suck it out… it's so backed up…♥"
He wanted to savor Topaz squirming a little longer, but he was starting to lose it himself. He began reshaping every needle-strand into a mouth—and then, mid-morph, a simpler, easier, far more fitting shape popped into his head.
Heheh. Gotta go with a milking-machine nozzle.
The suction hit like a vacuum seal slamming shut.
"Ohoh?! W-what is this…♥ It's too strooong♥"
He'd barely given that thick milk a light suck, and it was like a blocked vessel had blown open. Breast milk cascaded out in a waterfall, and one pull was all it took for her lower half to start fountain-squirting in total chaos. Whether it was the improved drug or not, that thick, concentrated mana-milk packed his mana tank to bursting in a way yesterday's couldn't even touch.
"Haaah♥ Nnhh…♥"
He was only sucking her breasts, and already Topaz's pussy was fountain-climaxing like mad. Her mouth hung slack, drool running, moans spilling out after what had to be dozens of orgasms. He looked from one to the other, torn.
Kiss first, or eat pussy first…
Then it hit him: he could just grow another strand and make another mouth.
Chu~
"Mmph? Fuhh… chuup♥ Hehh…♥ Kisses… so gooood…♥"
Honestly, given what he looked like, he'd been a little worried she might balk at kissing. Instead, the second he pressed a mouth to hers, she shoved her tongue in first.
Heeung…
There was none of that grinding-cock kind of sexual sensation, and yet something in him lifted, went light—the feeling of tongues sliding together was strangely, deeply good.
If kissing feels this good, then how the hell is actual sex supposed to feeeeeel!!
The thought that only people with actual social lives had been doing this all along made his entire previous life feel like a write-off. Then again, if he'd stayed human, would he have even held someone's hand, let alone kissed them?
While his mind wandered, he extruded a mouth-shaped tentacle from the center of his body.
Lower mouth, chu~ too.
"Fuhp?!"
Topaz, lost in the kiss, startled hard and snapped her closed eyes open. Then she shook her head no, no, no.
As long as I don't put it in, it should be fine, he figured, and licked her pussy.
"Nnnmph♥"
The second he licked her, Topaz—still shaking her head—jerked hard and came. A trash-tier pussy, true to form, wringing out a full female climax. And as he greedily drank down her juices—
Nnghhot?!
The moment he slobbered up her squirting orgasm, at least several dozen times the mana of her breast milk came flooding in.
Oogh?! H-holy shit that much doesn't fiiiit?! I'm overflowing!!!
Whether it was survival instinct or not, his usual near-double-digit IQ spiked hard, brushing the edge of three digits, and he found an outlet fast. He had to burn off this overflowing mana, now. How? Keep morphing strands to spend it? Or…
The answer is pussy! Ram! It! In!
"Nngh?! I-it's in♥♥"
He snapped the mouth-strand he'd been sucking with into a cock shape and slammed it straight into her pussy. He'd modeled it on his human-era dick, and maybe that was why the sexual sensation hit properly this time.
Ah. So this was pussy.
But there was no time to be moved. The colossal mana inside her vagina, like white blood cells hunting a pathogen, started searing his cock-shaped tentacle.
GRAAAAH!
"Nnh♥ T-tentacle… i-it's dangerous… pull it out…!"
On top of Topaz's panicked cry, the real-time pain of his cock being fried made him scramble to shut down every nerve—and in that instant, through the savage barrage of mana, he finally touched it: a thin membrane.
"Oogh♥"
Ahh… you…
He knew instinctively it was her hymen. He endured the pain, pushed as hard as he could—and the mana barrage won. The cock vanished.
Not a total waste: dumping mana to keep the cock from disintegrating had burned some of the overflow. But nowhere near enough! He quickly spawned a fresh Assay.
Go! Commence reverse charge!
"Ooh?! D-don't tell me you're… again?!"
Topaz startled all over again at the sudden foreign sensation. He'd already confirmed the feel of the hymen. Hell, by dumping mana into the tentacle's morphing, he'd already confirmed the taste, the texture, and even the shape. So there was nothing left to hold back for. Shut down every sense and just ram it in like a dildo, force her to climax. That was the play.
One piston stroke and it vanished; spawn another, slam it in, and Topaz's climax juices refilled his mana. Infinite loop combooo!
"Nnghoooooh♥!!"
The fact that even this many reverse charges couldn't punch through Topaz's hymen started filling him with self-loathing and rage.
Uraaah uraaah! A trash-pussy bitch dares try to pop me to death!!
"Nnh♥ Haaah!! I-I'm gonna lose my miiind…♥!! Ngh?!"
Regenerating a destroyed strand burned more mana than he'd expected. Bit by bit, expenditure started outpacing intake.
Kkngh!! For a trash pussy!! Just sit there and get pierced already!!
As if declaring that a trash tentacle like him had no right to her virginity, Topaz's hymen refused to break no matter how many strands he respawned and rammed in. He pounded and pounded, sworn he would take it.
How many times had he thrust? Every drop of moisture in Topaz's body seemed spent. Even when she came now, she only shuddered—no fluids at all. She'd been moaning so hard she was showing signs of dehydration, so he stopped. The love juice that had been his biggest mana supply had run dry. He couldn't spawn any more strands. He stopped.

"Hah… hehh…♥ Heeek…♥ Haah♥ Nnh… s-sorry but… l-let me drink some water…♥"
The sight of Topaz—who could pop him with a single finger—begging him to let her drink water sent a filthy rush of conquest through him. He decided to give her what she asked for. He still had enough leftover mana to reshape the intact strands, so the ones that had been milking her breasts became a mouth and a cock. The mouth-tentacle sucked water from a bottle, and then water trickled from the tip of the cock like a stream of piss.
"Heh..? D-don't tell me that's water…?"
A look of startled disbelief crossed her face—then she meekly took the cock in her mouth and started drinking.
Heheh. Looks just like she's drinking my piss. Hot as hell.
"Haa~♥ I thought it'd be lukewarm, but it's cold? You thought of me. Thank you♥"
Lukewarm-bordering-on-warm would've been even more piss-like and even hotter, but personally he could not forgive lukewarm water, so that one point he'd compromised on—he'd used mana to chill it.
Well then. She'd had her rest… time to pick up where they left off.
He gathered the strands toward her breasts again. Topaz smiled like she was welcoming him home, arms open—and just as he was about to dive back in, her smartphone started ringing.
"Ah, looks like a dispatch request. Tch, and we were just getting to the good part… sorry? Let's pick this up when I get back?"
In the blink of an eye she'd transformed. She gave him an apologetic pat and headed out the door. He'd be lying if he said he wasn't disappointed—but the fact that a magical girl that overflowing with a sense of duty had, until seconds ago, had her legs spread for pleasure with a mere tentacle like him only made it hotter.
Okay but like… now what?
Left alone in the house, he had become a tentacle of leisure. With nothing to do, he toured the place he hadn't gotten a proper look at yesterday—too distracted by Topaz—washed the dishes from her breakfast, and, while he was at it, cleaned to kill time. Maybe it was having more usable arms than in his human days, but even in a fairly large house the cleaning was done in no time. Unable to bear the idleness, he finally drifted over to the PC sitting in a corner of Topaz's bedroom and hit the power button.
Let's see what the community boards look like in an eroge world.
This was for information gathering. It was absolutely not so he could go back to being TrollTentacle6974 and start shitposting..!!