Thank you for the submission. We already have an entry for 少年愛 so this should be submitted as an amendment to that entry 
 (i.e. an additional sense) rather than as a new entry suggestion (just something to keep in mind for the next time).

https://ja.wikipedia.org/wiki/少年愛_(少女漫画)

This manga usage is not easily guessable from the normal meaning of the word, and 'shounen ai' is used as a loan word with a different meaning in English, so it's worth having this in the dictionary.