A powerful kingdom: forbidden love

Duncan and Evander Levine are twin brothers who have lost their parents in the interspecies war and were raised by their aunt who knows Tony Stark because she saved him from terrorists in Afghanistan and all their species hate humans and they see their aunt as the black sheep because she saved a human and she has sent them to Tony because of the war and they are after them because they are next in line to the throne and they have two important rules to always wear gloves and hide their wings because their powers are too strong so they can kill someone with a touch of their hand and when they came to New York and live with Tony and Tony knows about the important rules and he had a welcome party for them and they got to meet the Avengers and they became interested in two people: Bucky Barnes and Clint Barton and they knew it was forbidden to fall in love with humans