Hanaseba Nagai Futari no Hanashi: Soredake no Hanashi

Shinya's a manga artist who draws cutesy girls doing cutesy things. He and Haruhiko, a successful businessperson working in securities who loves Shinya's manga, have been dating for ten years. They're a lovey-dovey, nerdy couple. They renew their apartment lease, get it on in the bedroom, Haruhiko gets busted with adult manga one day by his boss, Shinya rushes to Haruhiko's side after he gets into a small traffic accident, they get it on more in the bedroom, they worry a little about their future, they get frustrated with each other's working situation, Haruhiko falls in love all over again for Shinya when he wears a suit, they vow to spend their lives together... no matter how much the world might change, their days together are spent filled with love!

(Source: Renta!)