Don't Say No...: My Foreign Boss Is Not a Gentleman

Overview

If you've been together for 500 years, of course you'd crave some excitement! These are the various stories of a human man and a male elf. Gilmier, an elf with a long life, falls in love with the human Sol and promises to watch over his beloved throughout his reincarnations. Even in their 500th year together, they are as deep in love as ever, but... they're stuck in a rut! In search of excitement that rivals their initial spark, Gilmier suggests breaking up with Sol, as he's sure their time apart would fuel their fire. However, upon hearing this, the ever-so-sweet and gentle Sol starts to show his rough side for the first time... (Source: Coolmic) Note: Includes one extra chapter.

Source: AniList