1: Yuyu! Mishter! What iz dat? Can it chake it eajy?
It's a sparkly mister shiny flower!! It's very pretty! It can really take it easy!!!
2: *SPARK SPARK*
Yu~n! Ichs vewy pwetty! It can chake it eajy!
3: Ah! Mister flower's very sweet sweet nectar is about to fall out!
*spark spark*(lesser sparking sound anyway)
Yuyu!!! Mishter sweet sweet! Fall into Remu's mouth eajy!
Rip-!! Ripp!!
4: *appear*
There's still a lot! Eat them all easy!
----
I'm pretty sure biribiri is the sound of him ripping off some tape and in the 4th panel, he tapes the yukkuri down to assist it in getting more of the "sweet sweet nectar"
--- I'm pretty sure sooi is just a sound to indicate exertion, so whatever works along those lines would be fine. It is, of course, overkill when dealing with yukkuri.