YOU SAID:

my mother was gasping for air under the sheets with my uncle

INTO JAPANESE

母は叔父と一緒にシーツの下で息を切らしていました

BACK INTO ENGLISH

My mother was panting under the sheets with my uncle.

INTO JAPANESE

母は叔父と一緒にシーツの下で喘いでいました。

BACK INTO ENGLISH

My mother was panting under the sheets with my uncle.