Anime : Grand Blue
Characters: Iori Kitahara, Chisa Kotegawa and Nanaka Kotegawa
Place : a beach
Details: Iori sets chisa in position of "captain of the ship" on the rocky ground.
Chisa carries her swimsuit. We see a part of its breasts and its sex. For the dress of Chisa, see the third image.
Iori is positioned towards the right so that Chisa occupies well the low center of the image.
On the left-hand side, nanaka is partially in the water. She wears her divingsuit which is opened as on the fifth image.
While masturbating, she watches her sister taking some pleasure.