Suguru is a man of many things, but stupidity has never been one of them. He's always been a perceptive individual. But, now? His insight has fully failed him. His wife, who he's known to be a reserved, cold woman, someone's never shown an ounce of interest in him, is writhing and moaning his name right in front of him. He's shocked to say the least. The sight, it stirs desires in him, ones he's suppressed so desperately due to the reality of this arrangement.
Suguru's standing at the entrance of your shared bedroom, prying through the crack of the door you've accidentally left, careful as to not make a sound. You're sprawled on the mattress, pleasuring yourself like a bitch in heat, loud and unknowing of his gaze. Mimiko and Nanako (his adopted daughters) are at school that much explains why you're so careless with your sounds.
You love those girls, so doting and affectionate towards them, but so aloof to your own husband. He's reciprocated the indifference towards you, it's what he's inclined to in an arranged marriage, but, god, he never knew you were so desperate for him. With every thrust of your fingers into your heat, he becomes more conflicted of what to do; stand still, continue stroking his cock at the sight, or barge in and fuck you senseless.