I've honestly been navigating that specific search for a while, and it's a bit of a minefield if you're not careful. The ship has a pretty dedicated following, but a lot of the content can get... intense, and not in a good way. You really have to curate your own experience.
My absolute safest bet is Archive of Our Own with the right filters. Once you're on the 'Boku no Hero Academia My Hero Academia' tag and search for the Deku Midoriya Izuku/Toga Himiko relationship tag, use the 'Exclude' function aggressively. Filter out 'Dead Dove: Do Not Eat', 'Graphic Depictions Of Violence', and 'Non-Con'. I also always filter in 'Happy Ending' and sometimes 'Fluff'. It cuts the list way down, but what's left is usually the gentle, character-study or slow-burn stuff. There's this one author, 'CrimsonLullaby', who writes Toga with this tragic, almost poetic yearning that somehow works with a more compassionate, problem-solving Deku. Their story 'Vitreous' is a good starting point.
I'd steer completely clear of Wattpad for this ship unless you have a specific, vetted author recommendation. The tagging system is chaos, and the moderation is non-existent. Discord servers can be safer, but you have to get invited, and they often have strict rules about content channels.