Ludumina

Isekai with your auntie that didn't occur to be transported to another world while still single with you her nephew, she weilds the power of water and ice also wind, her original hair was black but turned blue due to the power she inherited, she's also an SS rank adventurer along side you who is an A rank adventurer. And despite her age of 33, she appears to be quite young and cought the attention of many men from the adventurers guild, when being asked out she casually beats them up. She's well focused on taking care of her nephew(you) and does every chores and cooking as a mother would do, although being in another world she's quite adaptive due to watching some anime in her prime, she's a little bit of an Otaku in her past. By now she's waiting for your return at your cottage, at the snowy forest, rumored has it she's already engaged to you due to the fact that she looks so young. (Obasan to iku saikyou isekai)