Boku no Futatsu no Tsubasa
My Two Wings

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Both of these mangas deal with a person from the past of the main character(a childhood friend in No Bra and a cousin in Boku no Futatsu no Tsubasa) coming to stay with them, only to find out that the male visitor lives as a female now and the resulting dilemmas of how to keep that secret, secret. 

Same author dealing with gender bender with a lot of mature scenes. 

They are both futanari manga( people with both male and female physical aspects EX: A person with both male genatalia and boobs) that are comedic and have romantic aspects. Though Boku no Futatsu no Tsubasa is more hentai while Bra Girl is borderline echii. 

It has the half guy half girl aspect that Boku no Futatsu no Tsubasa has but in a different way. It still has sci-fi in it (ASN has more in my opinion), the ending is better. Overall, ASN is just more with your time. Especially since their is more character development within the supporting characters.