Well I'm not sure about the first one, even though I saw it on google, after reading a little real account, I don't think the image is from that manga

Real Account (II)
 

Both images are from the series, Real Account II by Watanabe Shizumu.
(Real Account II being chapter 10+ of Real Account)

This was a bit of a surprise find since the series isn't labeled ecchi on any of the manga sites.

One of the recurring sources of ENF involves one of the main females;
she has her nude/sexual photos on her phone repeatedly exposed to having to dress up in various costumes.

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A few other ENF scenes (a girl having her clothes melted off, and another getting caught in the shower, etc.):

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Real Account (II); Deadly Hide-and-Seek
 

One arc of the manga involves a deadly hide-and-seek competition, in which one group is has a tattoo randomly marked on his/her body,
and another group is awarded money every-time they scan those tattoos.

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While taking a break from the competition at a spa, the two female main characters are ambushed.
The girls try to escape, but they get trapped when cell phones fall into the foot bath in front of the exit, electrifying the water.
The girls escape by taking off their swimsuits and using them as stepping stones to cross the electrified water.

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What chapter is this from ,i couldn't find it !

chapter 165 there are some censored versions, but you can see it uncut here:

http://8yyls.com/104868/
http://www.2animx.com/index-look-nam...-id-181586-p-1

comic penguin club

I'm going to correct you, the manga is Layered, whose author is URAN. Comic Penguin Club is the magazine.
You can find some chapters of that comic in G e-hentai

Do you know if there is an English translation for the Mika Ni Harassment remake? I was a big fan of the original and would love to read the new version.

Any chance of a download link for the Mika remake?

Gym enf