https://www.dmm.co.jp/dc/doujin/-/detail/=/cid=d_207909/

If you like please 𝐒𝐮𝐩𝐩𝐨𝐫𝐭 𝐭𝐡𝐞 𝐀𝐫𝐭𝐢𝐬𝐭.
DMM、DLsite买本支付教程：https://e-hentai.org/g/3281951/106ebc5b86/

Hahahaha, I like this one, funny subversion.
Anyway, do not tag it as Netorare because it is isn't, it only touches the subject without implementing.

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The protagonist recently got a girlfriend, they are standard couple (and also nameless) having a good time as highschool sweethearts, everything is going well, they have dates, they have sex, pretty cool stuff, that is until Protag was fapping and he stumbled on a NTR work, he was flabbergasted, what it is genre? Protag got shook, he took it personally.

Protag was horrified at how significant others are taken away in these settings, shit, is that even real? How is that fair, he questions it... but Protag sensibly reasons that it is just fiction, there's no way it can happen just like that in real life, right? Buuuuuuut, Protag sticks with being a little worried due his girlfriend being pretty friendly, she has a lot of guy friends and Protag says she is quite bad at saying no, shit, what if she has already been taken and Protag doesn't know? He really took that NTR work to heart.

However, Protag has a sudden calm realization, why get frustrated over this? Protag just needs to train his dick to be absolutely irresistible, that way his cutie girlfriend will never even entertain the throught of ever letting herself slip away, YES! Protag vows to get a huge, sturdy, mighty cock, that way even if Girlfriend is under the process of being taken away she will run back to him, no biggie. Thus Protag does everything in his power to enhance his meat rod, supplements, cock rings, muscle training, whatever he could secure Protag took it.

One month of relentless training, Protag feels his efforts bore fruit, time to take it for a test drive! Protag and Girlfriend are eating on their usual place at the rooftop, Protag invites her to his home after school, then they are doing homework together at his home, the air is a little akward, Girlfriend voices her worry, she noticed Protag hasn't been as lively as he is lately... that's it, the time is right he believes, Protag just randomly drops his pants and shows Girlfriend his well trained lower region! Naturally, Girlfriend freaks out, what, what!? It wasn't like this before! Her shock prompted Protag to quickly explain himself... I see, Girlfriend calmed down.

She lovingly tries to calm Protag down, he did that all in fear of the mere possibility of her being taken away? Girlfriend assures Protag she loves him, something as superficial as dick size won't faze her, whooo, Protag roars in relief as he professed how much he loves his Girlfriend, well now that Girlfriend took that as Protag putting the effort for her sake, she might as well go for a spin drive to check the results, but she is a little shocked still, a dick this big and sturdy looks like a pain to take but Girlfriend goes for it anyway, she too embarrassedly says she was looking up in the internet for more ways to please Protag during sex, Protag does some foreplay too, he wasn't training his dick only either.

Now that it's time to insert, Girlfriend gets a little scared again, this massive thing entering her, whew, she asks Protag to be gentle, oh he will try... as soon as he penetrates Girlfriend she gets her world rocked, she faints! Protag keeps pounding Girlfriend as she under a trance, it takes her 30 minutes to get her senses back, she can't believe he is still at it, hah, Protag boasts he was backed up for a whole a month, all of it make this decisive attack! Now is going to cum though, after Girlfriend has cum plenty of times already, in her thoughts she cannot believe how unreal Protag's dick now feels, that thing should have never entered her, thinking she is going to break!

Protag finally climaxes, Girlfriend can't believe he came so much but is still hard, she asks for him to take mercy on her for now, please, she can't move anymore, she will take more of him tomorrow, she promises, Protag is clearly left wanting more... next day on school Protag immediately seeks Girlfriend to do it hidden at the equipment room, once again she is shocked at his potency, she can't take it in stride, what's more they almost get caught so Protag stops pushing even though he couldn't even cum this time.

To make up for the blue balls, Girlfriend wears her swimsuit as per Protag's request, and this time it dawns on Girlfriend she has been unwittingly changing too, as soon as Protag wants to let out his first load on her swimsuit Girlfriend is filled with sudden ecstasy, the huge load gets to her mind, she is extremely aroused, finally breaking in a huge orgasm, what was that!? Girlfriend feels she has changed too? Immediately back home, the transformation has fully set, Girlfriend has broken into absolutely loving Protag's new dick, it's amazing she claims, heh, Protag rightfully asks her if she is glad he took his time to train that cock, YES! Girlfriend is elated, she loves big dicks, thus they both immersed themselves in pure sexual bliss.

The clear contrast at the end as Girlfriend begs for more of Protag's dick once he cums, just once is not enough, she wants more! Protag ends the story as he narrates the bizarre outcome of it all, he feels his new super cock ended up stealing his girlfriend, heh, but he doesn't regret it, it truly was the right choice as he sees Girlfriend cutely begging him to tease her a lot more, THE END
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Still laughing, I will buy this one, it is good enough for me to actually support financially.

Base +22