Yaoissss

there's a BL that has like one scene of that, it's called BJ Alex

Are u talking about a fleshlight? If so then http://www.mangago.me/read-manga/window_beyond_window/ theres only one scene though

you mean urethra play shbdndhdbdd in youjin theres one scene but here's a list if u want more
http://www.mangago.me/home/mangalist/100188/?filter=&page=3

http://www.mangago.me/read-manga/junai_drop_out/

sounding happens in later chapters, it's worth a read

http://mangago.me/tag/fleshlight