>Lex Luthor brainwashes Supergirl into making a sex tape with him and sends it to Superman
C'est la vie. Superman understands that this is just part of the superlife.
>Superman leaks it online, Supergirl becomes the star of her own reality tv show, Lex Luthor fades to celeb obscurity
>Superman is the cameraman for the next installment of Sex Luthor
>"I remember when that happened with me and Barda "
You know Supergirl and Lex were an item in the 90s, right? No brainwashing involved.
No sex tape, but Superman was aware.
Lex also faked his death and put his brain in a new clone body after Kryptonite cancer killed his old one in the early 90s. He posed as an illegitimate son who was born/raised in Australia, I think.
Lex brainwashes Supergirl into being his fucktoy, and even builds a high-tech Ultra Pounder machine to fuck her 24/7.
At parties Lex invites everyone to fuck Supergirl.
Superman crashes one such party, but when Lex tells Supes that his sister wanted to get blacked he loses all sympathy, telling Lex, "she's all yours I never could stand the stupid cunt". Thus Supergirl becomes Lex's brainless bimbo sex toy.