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1. Sincerely Yours by persyv

   Fandoms: Harry Potter - J. K. Rowling, Marvel Cinematic Universe, Spider-Man (Tom Holland Movies), The Avengers (Marvel Movies)  

   • Mature
   • Creator Chose Not To Use Archive Warnings, No Archive Warnings Apply, Underage Sex
   • F/M, M/M
   • Complete Work

   23 Oct 2025

   Tags

   • Creator Chose Not To Use Archive Warnings
   • No Archive Warnings Apply
   • Underage Sex
   • Peter Parker & Harry Potter
   • Peter Parker/Harry Potter
   • Sirius Black & Harry Potter
   • Tony Stark & Harry Potter
   • Tony Stark & Sirius Black & Steve Rogers
   • Sirius Black & Maria Hill
   • Sirius Black/Tony Stark
   • Harry Potter & Steve Rogers
   • Ned Leeds & Peter Parker
   • Sirius Black & Remus Lupin
   • Peter Parker
   • Harry Potter
   • May Parker (Spider-Man)
   • Ben Parker
   • Original Female Character(s)
   • The Avengers - Character
   • i dont wanna tag them correctly they r like a lot of ppl
   • Sirius Black
   • Maria Hill
   • Remus Lupin
   • Implied/Referenced Child Abuse
   • Pen Pals
   • Child Neglect
   • Dursley's A+ Parenting
   • Abusive Dursley Family (Harry Potter)
   • Slow Burn
   • bc theyre kids
   • Friends to Lovers
   • Eventual Romance
   • Peter Parker is a Mess
   • Other Additional Tags to Be Added
   • Tony Stark Acting as Harry Potter's Parental Figure
   • Protective Tony Stark
   • BAMF Tony Stark
   • Sirius Black Free from Azkaban
   • Manipulative Albus Dumbledore
   • sirius/tony energy
   • Draco Malfoy & Harry Potter Friendship
   • Slytherin Harry Potter
   • Canon Divergence
   • Peter Parker's Field Trip to Stark Industries
   • like in the chapter 50
   • harry is too intelligent for his own good
   • no beta we die like harry potter's parents
   • Warning: Skip Westcott
   • Skip Westcott Being a Jerk
   • Abused Peter Parker
   • Rated M because of implied sexual abuse
   • Teen and up until chapter 47 (I think so)
   • Suicidal Thoughts
   • Suicide Attempt
   • chapter 83 cw: underage sex
   • Consensual Underage Sex
   • both peter and harry are seventeen when it happens
   • Translations are not allowed for this work

   Summary

   Cuando Harry tenía siete años, su escuela primaria organizó un proyecto de amigos por correspondencia, coordinándose con una escuela en Queens, Nueva York.

   Cuando Peter tenía siete años, recibió una carta desde Surrey, Reino Unido, de un tal Harry Potter.

   Translations for this work are not allowed.

   Series

   • Part 2 of crossovers HP/MCU

   Language:

   Español

   Words:

   48,830

   Chapters:

   85/85

   Comments:

   159

   Kudos:

   967

   Bookmarks:

   146

   Hits:

   22,949