I believe that's a picture of two happy people sharing a box of candy. I think you're looking a bit too deep into this one.

Honest question - what do you see as sexualising in that picture? (I'm not going to question the young girl part, but I think that depends on culture / drawing style / reception)

In Japan you have 30 year olds (and older) who dress in that manner[1] and behave in that manner and speak in that manner. It's just different --so viewing it under a western lens probably introduces misinterpretation.

[1]Just look into Rorita fasshon, etc.