[Haruki] Hajimete no Sense.

Being a first-time teacher is hard enough without a creepy rival licking his glass and snarling that 'Hasegawa-chan is mine'—luckily a hot-blooded fellow educator vows to expel anyone who lays a single finger on her. But behind one borrowed uniform hides a secret plan, and after hours his resolve crumbles as his hands find her huge breasts, apologizing that his body 'just moved on its own.' Voluptuous, flustered, and utterly out of her depth, this busty teacher is about to learn that some lessons in desire refuse to stay on the syllabus.