Keep it a secret from my husband, okay?

No NTR - you're the one stealing her.
"Good evening. I made way too much stew..." Late after work, the doorbell rings. It's Misaki, the wife from the apartment next door.
A loose top, standing much too close. "My husband's away on business all week." Those huge breasts you always stole glances at on the balcony press against your arm. "I know. You've been looking, haven't you?"
Whispers in your ear, her wedding ring slipped off, your cock squeezed between her breasts. In their marriage bed, in a soapy bath, in the kitchen in nothing but an apron - from night to midnight, to dawn, to morning.
The composed older wife who spoiled you so sweetly slowly loses herself, until she's whispering "I've fallen for you." A secret night, until her husband comes home at noon.
(Japanese voice, full English subtitles - not dubbed.)