You could say it's not grooming but yullur still started liking saya from an early age so pedo allegations are still on the table. It's unclear if there was grooming but it's still likely present imo
I don't see any evidence of pedophelia either. Yullur genuinely loved saya as an uncle. So far throughout the manga he avoided any sexual or liking advances beyond that. A pedo would've done something sexually related by touch or words when saya was underaged. Yullur even scolded his dad in the previous manga for causing saya to kiss everyone because his dad was kissing the mom too much. So my thought are Yullur's affection was pretty genuine until saya became an adult so pedo doesn't apply
First of all yullur didn't groom the kid. He realised his feelings when saya is now an adult. He was pretty much the "uncle" until recently. He also did not intend to have intimate relationship with saya in the first place.. throughout growing up, it was saya who pined on him and yullur had no idea. How is this grooming again?