The Saki manga is written by someone else, Jaga's just the artist for it. Jaga does an excellent job with things like body language for these kinda stories though.
He probably got preyed upon as a little kid, that explains why the childhood friend is super paranoid regarding his step-mom. Took her a while to take initiative and start stalking him (too) though.
I wonder how she's going to figure out this is the same woman he met through the sugar mama app.
Hope he isn't a future victim of a murder and is instead being introduced as a side character for her school life. It helps humanize Spica and gives a better view of where her morals are.
Him being flustered is cute and it's gonna be great when he finds out that the sweet girl he met is a...
Fitting for Sloth to have the melancholic, depressed aspect to it. Although Belphegor didn't choose to wallow in apathy and instead decides to take measures to spread it (and a quiet end to the chaos of life) once he got the opportunity.