Changing the future

where the missing cousin of James potter who is like a sister to him he was disappeared into thin air when her family is slaughtered not knowing that she is still alive he mourned her on the other hand she forgot who she was except her name and powers and she became a self-made youngest billionaire in the fashion industry and medical industry and she became the famous Esmeray witch and fall in love with the only Genius, billionaire, ex-playboy, philanthropist Tony stark
watch the avengers who are transported to Hogwarts just before the infinity war and Loki getting killed by Thanos to watch the past and future of the avengers to make the wizarding world realize there are bigger threat's in the future
will the wizarding world help them to save their both worlds?
will they be able to save it?
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Tony Stark X oc
peter parker and Harley Kenner are adopted after the civil war by this couple
except for the OC character, everthing belongs to the marvel studious