9 Willow Street Series by Nell Iris

Heartbroken after the death of his beloved Nana, Hannes, the family outsider, finally allows himself to grieve. The legal battle over Nana’s quirky old house -- the only place he’s ever felt accepted and loved -- is over, and he moves in and finds a sense of peace. ... And a rabbit. An adorable bunny with a huge personality moves in, too, and refuses to leave. Hannes instantly falls in love with the sweet animal who helps heal his heart... moreHeartbroken after the death of his beloved Nana, Hannes, the family outsider, finally allows himself to grieve. The legal battle over Nana’s quirky old house -- the only place he’s ever felt accepted and loved -- is over, and he moves in and finds a sense of peace. ... And a rabbit. An adorable bunny with a huge personality moves in, too, and refuses to leave. Hannes instantly falls in love with the sweet animal who helps heal his heart. But one morning, Hannes’ view of the world changes when the rabbit transforms into a man. A man named Mattis. After the initial shock, Hannes and Mattis discover a connection between them that runs deeper than it seems. Will their newfound feelings survive unraveling secrets and meddling families, and grow into something real? Something deep and everlasting? less

Sequel to 9 Willow Street. Hannes and Mattis have been happily married and heartbound for two years when a tiny, one-eared rabbit shifter kit hops into their lives and seems reluctant to leave ... This story is a short glimpse into Hannes and bunny shifter Mattis' happily ever after.