浴

This story is quite lascivious, sorry... Now, imagine you are at a 混浴　（こんよく） [two kanjis we now know] Onsen (温泉), and you are watching a woman bathe. Just picture the water dripping down her cleavage (that valley in between her breasts). Note: cleavage in Japanese is 谷間.

Source: Kanji Koohii community