I tried translating a manga by Yamamoto Tomomitsu.

This seems to be a new artist.
And a note about the title: while "seishun" indeed means "youth" and "adolescence" and whatnot, here, the first kanji of the word has been replaced with the identically pronounced 性, which is closely related to all things sexual (among other things).

I swear to god if I see another pun

Another pun

Anyway thanks Necro sensei for another amazing translation.

Base +7, SuperGenericAnon +7, bloodredwaterbottle +6, coleccionista903 +6, gotee +6, Chaotic Anonymous +6, Nitramy +6, Megaton +39, Haruka Aiphos +3, pal8080 +7, Rod_Perv +6, lknd14 +7

Another work with the Necromancr seal of approval.

Base +6, SuperGenericAnon +7, gotee +6, Chaotic Anonymous +6, Oddsky +7, Rod_Perv +6

Kanji puns best puns.

Also,that reversal halfway through and the vanilla,LMAO

Base +9, SuperGenericAnon +7, Chaotic Anonymous +6, Haruka Aiphos +3, Rod_Perv +6, jere512 +6

You've been hit by!
You've been struck by!
A Smooth Senpai!

Base +7, bananaramadama-sama +7, aych001 +6, Chaotic Anonymous +6, Nitramy +6, Megaton +39, One above all +1, Haruka Aiphos +3, Draw99Gray +17, DxKuro +7, josh1002 +6, Liquid Shadow +6, as102 +10, and 12 more...

Such an adorable story
Senpai is always the strongest... Critical hit to the feels..
Thanks based Necromancr

Base +26, bananaramadama-sama +7, SuperGenericAnon +7, Nitramy +6, Haruka Aiphos +3, Rod_Perv +6

Good thing this guy is a boxer, because her brothers might not take kindly to what he's doing...

Base +8, plusarkos +6, Nitramy +6, Esp007 +3, One above all +1, Oddsky +7, Ooe Kintarou +14, Taka at work +10, Daddyfatsack +6, yiyi1993 +8, lknd14 +7

Thicc girl + baby face. Too good!

Base +9, coleccionista903 +6, gotee +6, Nitramy +6, Megaton +39, Haruka Aiphos +3, Oddsky +7, as102 +10, Taka at work +10, Daddyfatsack +6, Rod_Perv +6

Next chapter is her nursing him back to health after her brothers beat him into the hospital.

Base +6, ninjdsfo +6, Chaotic Anonymous +6, Esp007 +3, Haruka Aiphos +3, Taka at work +10

As always NecroManCr translationa never fail to impress me

Base +6, Chaotic Anonymous +6, Taka at work +10

>brothers
Well, this is hentai land so...

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If she has that many boxing brothers, this guy is going to see hell itself when they find out

Base +6, Nitramy +6, Taka at work +10, PinguPrin +7, Vorlion +6

Kamo1, this guy is fuckin' ripped. I wouldn't be worried.

Base +6, Taka at work +10, Vorlion +6

@Kamo1
Or maybe they're not crazy and won't beat up their sister's boyfriend "just because"

Base +7, RKGS +7, Undeadcynic97 +9, Vorlion +6