Interestingly enough, this comes with an additional soundtrack that you can listen to while you're reading as your "Onee-chan" walks in on you and stuff.

You can find it here:
https://www.dlsite.com/maniax/work/=/product_id/RJ270976.html

I need a hot dumb older sister.

Base +24, Quey +6, Ryougi +11, daimmo3dma +8, Alioshin +4, cads +6, hujkl +17, yutshu +6, rockingoldensamurai +6, asdfghfd +7, JEFFWANTSTOFAP +6, Rabbitman91 +9, Cadavrus +6, and 29 more...

Boi, you created this monster. Take responsibility like the irresponsible little brother you are!

Base +6, daimmo3dma +8, Leo Showtopper +9, Quey +6, 20Ilya +33, rockingoldensamurai +6, RobBob17 +6, JEFFWANTSTOFAP +6, shuntensatsu +15, Ghostface211 +1, Cadavrus +6, Zyklon Bee +6, SCSS +19, and 20 more...

This stuff what we called..hmm "audio book"? Interesting.

Base +6, daimmo3dma +8, Leo Showtopper +9, rockingoldensamurai +6, Poliana +6, Magoloso +6, IglsUnth +6, bigscuba +5

We need older milf sister

Base +11, JEFFWANTSTOFAP +6, Poliana -6, Brego1 +6, Leviathan +8, D038176 +4

Sister with pixie cut and no knowledge of shame - give me more!

Base +6, Poliana +6, GGS +10, Leviathan +8, imonlyhere4porn +6, D038176 +4, Quartz Saint +6, Konola +7

The whole time I thought the sister was just a pervert who pretended to be retarded, but she actually is. Oh well, this is fine too, I guess.

Base +6, Hitoshurasupreme +6, Poliana -6, Eon87 +6, bigscuba +5, JumpingJellybeans +5, HarleQ +6, Konola +7

y'know what this was too hot especially mixed with a bit of innocence with a hint of eroticism!

Base +6, Konola +7

feel like the lack of a surprise pregnancy at the end was a missed opportunity...

Base +6, Konola -7

We really need new tag "Innocent" when one or more of the party is actually dont have a clue what are they doing (no hypno though)

Base +9, treybeats +7, Konola +7, Ion_444 +6

reverse mating press

Base +6

Really wish there was an airhead tag. This is my fetish!

Base +6, treybeats +7, DFCcakelove +6, Konola +7, Ion_444 +6