This only applies to the Waniverse(TM), otherwise just look in the nearby windows/behind the bushes, if you see multiple couples banging you're either in a hentaiverse or a nudist colony.
pyon pyon: hop hop (like a rabbit)
gugugu...: stretching, grunting with effort
mu...: frustrated grumbling
chira: peek, glance
pekori/peko: bow (slight)
para para: pages turning
piin: exclamation mark
nico: smile
poripori: scratch scratch
gokuri: hard swallow
boin boin, tapun tapun: oppai bounce
gtan gotan: train clanking over the tracks
mofu mofu: something fluffy like a pillow or marshmellow
mozo mozo: soft shuffling fabric
chira: flash, quick, peek
nugi: shortening of the verb to strip, sound of her undressing
zui: usually the sound of fast movement, not sure why its used here?
muku muku: throbbing growth
toro toro: something thats wet
kuchu: wet sloppy kissy sound
gugugu: action of sliding it in
zubu zubu: like her vajayjay swallowing him
puchu: see text
chu/chuu: kiss
kuchu: wet sloppy kiss
pan pan pan: slam slam slam
kyun kyun: squeezing sound, also used for heart throbbing like "hnnngh" so much emotion!
byuu byuu/pyu pyu: spurt
bin/gin: hard or stiff
jyururu: long suck
_φ(* ̄0 ̄)ノ Gather all to the Library complex
For A Tale of Noisy Sex!
Through onomatopoeia, a sexy encounter
"Is this Globalization, too?" THAT DOES NOT MATTER!
"Muku muku" he went and "toro toro" as she
As their lust filled the halls, so erotically!
A "vivid confession" to their hearts skip a beat
Fresh Vanilla for now (but a sequel would be just as sweet)! ( Í¡° ͜ʖ Í¡°)
A tale of noisy, sweet Vanilla sex...Nice.
He kinda got dragged along at first, but hey, considering what happened, I'm sure it was definitely worth it.