A/n: Story covered has changed from it's original, due to me entering the final arc of this story!
When a young man makes a joke wish about taking Issei's place as the Red Dragon Emperor, he gets the wish granted! At the cost of his manhood, that is.
It's been about three whole weeks since Y/n was Isekaied into the world of High School DxD. At first, Y/n did complain about it a lot, but after the fifth day, Y/n realized he was fine living here. Why, you may ask? Truth is, he didn't have much fun in his old world, but now he can have a crap ton of it, in a whole new way.
However, we see Y/n in her room, trying to put on a bra for the first time. Since she wasn't used to putting on a bra, she went without one for the last three weeks, but Miki Hyoudou scolded her for not wearing one when she found out, as she said that she didn't raise Y/n that way.
Y/n: *sigh* This is so hard...
As Y/n tries to get it on, it feels tight around her chest.
Y/n: I can't believe I'm actually going to have to buy a bra... But first... *sigh* I got to get this one on first.
*Time-skip*
We now see Y/n in a lingerie store, with him blushing like a girl who just had her first kiss.
Y/n: I can't believe I'm actually doing this...
As Y/n slowly walks in, he feels something grab his shoulder.
Y/n: *screams*
???: *laughter* Oh man, that's the Shy Princess for ya'!
Y/n: Wait. That voice...
Y/n turns around to see Aika Kiryuu.
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Y/n: A-Aika?!
Aika: Yup! So what are you doing out here?
Y/n: Oh! W-Well...
Aika then gives Y/n a smug look, before going right for Y/n's breasts.
Aika: Oh~! Looks like you're entering a growth spurt, Princess~!
Y/n: Stop it! Get off of me!
Y/n then tries to shove Aika off of her, and after a few attempts, manages to do it.
Y/n: *panting*
Aika: Wow, Y/n! You've gotten a little stronger!
Y/n: *blushing* Please stop...
Aika: Okay, okay! It's just so fun to tease you~!
Y/n: *blushing*
As Aika leaves, Y/n slowly starts to regain her composure.
Y/n: Okay, now just head in, and find something that works for you!
As Y/n enters the store, she sees a vast variety of lingerie.
Y/n: Holy crap! There's so many! But which ones do I pick, and what size am I?!
Y/n then starts to look around the store, like a lost child in a mall, when an employee notices.