Ecchi-sama wrote...
This is a crop from page 48 of Renai Sample. I'm curious about something, is this really just meant to say "Slul" ?
I read it as a wet/sloppy "lul" which I read as the sound a tongue would make while moving around.
Stick your tongue out, flick it left/right or up/down it around and make any audible sound. You'll end up going "lululululul"