A Younger Stepsister Who Only Has Sex With Me on Days That are Divisible by 3 or on Days That Include The Number 3 and Her Friend Who Loses Control o…

[MangaDex]

 

[HeatManga]

Thanks for reading this chapter!
Their socials
pixiv
Twitter

 

[IronMace1990]

9th for Imouto, 10th for Imouto's friend. Then on 15th and 30th, it'll be a threesome

 

[lesseffective]

So if you know that already, what was with the derisive footjob yesterday?!

 

[xanon]

Oh my! Is that foreshadowing?

 

[Brzydzi]

Oh my! Is that foreshadowing?

It's not foreshadowing, it's foresight!

 

[meltworkzz]

You guys thirsty for 15th huh. I know the feeling

 

[poweron]

There LORE !!!!

 

[jorgelotr]

Onomatopoeias:
ピューン -> sound of a beam (as in a beam gun), "pew"
パンパン -> either "smack smack" or "bang bang"
ドーン -> strong hit, "blam", "boom" or "clonk"
ピコピコ -> this weird sound may by cartoon game characters when walking, mainly in 8-bit games or cartoonish games

My best guess is that they are playing a Super Smash Bros. clone, with the first one being a beam move, the second normal attacks, the third a heavy hit and the fourth a particularly cartoonish character running (Kirby?).

 

[velatic]

holy shit they are aware of their own situation

 

[IronMace1990]

You guys thirsty for 15th huh. I know the feeling

If people here are already thirsty about the 15th, then what will happen to them on the 30th?

 

[bondejeger]

If you wonder about SFXs, Jaded Network is usually a great place to check. It's been a bit wonky lately, but it still works.
http://thejadednetwork.com/sfx/
Piko piko is usually a gaming sound similar to click click I think, and doon is probably something similar to boom. You have piko piko in the manga title "Kimi to Pico-Pico" for instance.

 

[AnimeCruizer]

Since when did sexual desire count days