YOU SAID:

I enjoy long walks on the beach while getting penetrated on the back

INTO JAPANESE

私は背中に浸透しながら、ビーチで長い散歩を楽しむ

BACK INTO ENGLISH

I enjoy a long walk on the beach while penetrating my back

INTO JAPANESE

私は背中を貫通しながらビーチで長い散歩を楽しむ

BACK INTO ENGLISH

I enjoy a long walk on the beach while penetrating my back