Approached by My Childhood Friend ~The Day She Went from Just a Female Friend to My Lover~

Momoka is a highschool girl who indulges in masturbating every night while thinking of her beloved Daiki, her childhood friend. He got dumped by his girlfriend recently and was feeling depressed, so Momoka gathers the courage to invite him to her house, intending to console him.

"Momoka's house? I haven't been there since we graduated middle school. Let's go look at some photo albums!"
With a few words from Daiki, the two of them go on a nostalgia trip, viewing their childhood photos. Among those was a photo of little Momoka, clad only in her panties, with a big smile on her face...

"You perv..."
In the midst of this awkward mood, Momoka suddenly lays her head on Daiki's leg and gives herself a lap pillow.

"Hey, Daiki. You don't have a girlfriend now, do you? Y'know I, I've been in love with you since forever!"
Momoka exclaims to him, while she begins undressing her uniform.

"It's way different from the one in the album, isn't it?"
Right in front of Daiki's eyes was the sight of Momoka's body, now all grown up.

"Daiki, please. I want you to get to know all of me."
And so begins their relationship that goes beyond more than just childhood friends...

(Source: DLsite)

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[Note: This has 2 near-identical versions, one is a heavily censored softcore version and the hardcore version marked R-18 has mosaics. The covers are slightly different, but the story is the same.]