There you have it, another serving of Gachonjirou taking this series for the NTR wild ride, the previous release being totally vanilla was to pave way for this after all, Gachonjirou will not pick a lane for this, he is likely doing whatever he feels like it.

This one plays almost the same way as the Onsen one too, Mari has sex with Sakamoto at first, then through contrived circumstances caves in the pressure of horny virgins by making up some excuses in her mind that she is not technically betraying Sakamoto, but doing for his sake even, also it bears to mention they are just sex friends still.
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Here Mari just wanted to have some cosplay sex with Sakamoto, she does so, they are very happy sex friends, Sakamoto is eager to take some pictures of Mari but his cellphone camera won't start, he claims his phone is pretty old at this point so it must be that, so he can't take photos of Mari, that way she leaves for the actual photoshoot planned with a girl friend of hers, whoa, Sakamoto didn't even know Mari had girl friends!

Mari says she has, so Sakamoto can rest easy, Mari tries to calm him down since he was kinda iffed over Mari being intensely stared at by photographers in what could be a lewd photoshoot, but since they just had sex Mari tells Sakamoto his semen still fresh in her pussy is like a charm, like he is there with her in spirit!

Oh boy...

Mari's conviction doesn't last much, as soon as she gets in the photoshoot her girl friend had to skip it over having a flu, she didn't want to get anyone infected, when the guys assume Mari won't do it because she is alone amongst a group of greasy guys, no such a thing, Mari won't belittle the guys, they worked hard preparing for this so she will do it! Naturally, the greasy nerds start to get horny from getting all of Mari's lewd angles, and she too is getting a little hot from noticing their gaze, the fact she just had some sex with Sakamoto earlier has something to do with it.

Thus the comedic NTR setup is laid out, the nerds beg Mari at first to show them her pussy, they will pay 10,000 yen each! Mari tries to refuse, clinging to some sense of loyalty to Sakamoto but her mind immediately pulls a funny mental gymnastics, it's thirteen guys offering 10k each so that makes it 130,000 yen, she can buy Sakamoto a new smartphone! Yes, it's not like she is gonna to have sex so it's ok.

Then things escalate when one guy asks Mari to let him eat her pussy for 50,000 yen! Wait no, that can't happen... buuuut that makes it 180k total, she can buy Sakamoto a high-end phone! It still isn't sex, right? Mari gives the ok, whoa he sure is great at eating pussy, better than Sakamoto, ah the good ol' netorare comparison dialogue, but after he had his taste of poontang the guy immediately offers 100k more if Mari just let him have sex with her!

Whoa, that would be 280,000 yen total now, Mari can buy Sakamoto the best phone on the market right now, the summit of tech! but no, no, no! Mari tries to set boundaries here, sex is no good... then the remaining 12 guys also offer 100k each, no fucking way, that is over 1 million yen! Mari is awestruck with so much cash upfront, that is her months worth of working at that restaurant for just having sex, hmmm, Mari is trying to excuse herself asking if they are really sure, as if deflecting her willingness to do it, she is just a normal girl you know, she is not a virgin either Mari makes sure to tell them...

The dudes immediately rebuke that little display of self deprecating, Mari is absolutely gorgeous they say, she is worth every single yen, so please, please they ask, have sex with them! Mari caves in, she wants to make them all feel good, Mari tells the guy who first ate her pussy to step in, he will be the first.
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Is series running of negative continuity at this point? The previous vanilla version was established as happening before the Onsen episode, this one I don't know, but since Mari repeats the exact same scenario as the Onsen one without actually referencing it, I assume this is still set before that, but that would also make Mari just a casual loose girl who doesn't really think sex and commitment are intertwined, she will have sex with people other than Sakamoto if it serves a purpose, in this case helping Sakamoto buy a better phone at first, but then just like in the Onsen's case where took upon herself to help some sad virgins, Mari here just gives up on the Smartphone pretense and wants to answer these thirsty nerds' fixation on her.

I believe this is an ongoing Fanbox thing, page 48 definitely isn't the end as Mari calls the first guy to have sex with her, that doesn't seem like an actual ending point.

At any case Gachonjirou might just be having fun and probably doesn't care whether this series is vanilla or netorare, he is kinda the comedic author after all, if you read all of his body of work in hentai and outside of it you can tell he is just having a laugh.

Base +22, EHCASUAL +6

I can forgive it due to the ridiculousness of it all. So long as the author is aware it's parody I'm ok with how it turns out. Plus he'll probably make a vanilla version as well.

Base +8, derdie -20