I don’t think Mest is attracted to kids (ew). He didn’t sexualise them at all. Rather, I think he has a massive soft spot for them. My mum is the same way. Whenever she sees little kids she finds them so cute that you can physically see her become a bit giddy at the prospect of pinching their cheeks and stuff.
I think Mest sees them in an innocent light, thus the ‘angel’ reference. The panel was all bubbly and fluffy, he found them cute. That’s normal. It would also make sense to how he looked after Wendy in the past. Kids are his weakness, I think. He can’t say no to helping them out and stuff.
That’s how I’m going to look at it anyway.