The feeling of rescue (Patreon)

Even though she can't die, this doesn't stop Asougin Rin (Daughters of Mnemosyne) to experiment the experience to drown...at least, pretend she did, as she wait for her rescue diver Samus (Metroid) to rescue her.

She finds odd that she can still hear Rin's heartbeat, unaware that she was still alive.