"A flirtatious guy who's keen on physical intimacy x A straight-laced, serious bespectacled guy
The two from extreme opposites inch closer together: a dawdling, gradual love ?"
Basically opposites attract. This is a spin off to a different series of the author where step brothers fall in love. This is an enjoyable quick read.
Hysteric na Kurokami Megane-kun wa Igai to Kawaii