Do you think wings might be possible in the future, at least visually? I could see there being a quest for a succubus-magic spell to grow/hide your own wings, or maybe enhance existing decorative wings (like for fursona characters) with the power of flight. It could give interesting options in combat, and/or maybe just the ability to travel to places quickly at the cost of stamina, maybe as an alternative to a teleport spell. If it were me I'd make a Sky area that's "layered" over the existing world, which you'd traverse to get to places by air and be able to encounter flying enemies, but that's just me - I love flying. Having the option to have purely decorative wings at the start then enhance them later could also be a good way to expand on the lore of why furries exist in the game.
Much smaller request: More feathery/bird type options for character customization. My fursona is essentially a feathery dragon with bird-type wings, and just having them have fluffy fur-type details isn't quite what I'd hoped for. I understand that this game is in development tho, take your time.