After a long week of beating up nefarious supervillains and troublesome evildoers, Marcus and Miss Mighty take a well-deserved vacation at the beach. Even so, their lust for action remains as high as ever. Both of them, but especially Miss Mighty, decide to show off who can last longer than the other in sex. Thus, they commence their bout of nonstop fucking.
Hours pass, and neither show any signs of slowing down, even as Marcus fills up condom after condom. As they run out, he realizes for a moment that he could potentially knock up his partner, but soon goes back to fucking and sucking on her massive breasts. Miss Mighty also knows, but she doesn't care. Making nonstop love to her partner is not only blissful, but it (and the possible maternity leave) proves to be a greater challenge than any villain they've ever faced.
(Bigger versions found on my Patreon.)