Napoli have a slight chance of qualifying for the quarter-final stage of the Champions League, but to do so they must beat Real Madrid comfortably.
The La Liga leaders take a 3-1 lead to their Italian counterparts, who are in good form having recently beaten league rivals Roma 2-1.
Napoli have a number of dangerous attacking stars, with Dries Mertens in particular enjoying a fine campaign to date, so Tuesday's encounter should prove to be an exciting affair.
Napoli will no doubt need their fans to be in full voice should they wish to win, and one supporter decided to put their fellow supporters' loyalty to the test by posing as a Real Madrid fan andpromising to flash them if they simply shout 'Forza Real Madrid'.
Unsurprisingly, plenty of the fans sold out their allegiance to Napoli for the chance of a flash only to be confronted by the woman afterwards, who revealed herself to be a fan of theStadio San Paolo club.
Girl goes around Naples offering to show her boobs to any Napoli fans who say "Forza Real Madrid"
You need to see how this one goes  pic.twitter.com/xBZDyah25f
The girl was furious with her fellow fans immediately after, shouting 'I'm more Napolitano than you' and 'You sold out! You're worse than Higuain!', and in all fairness, the behaviour of all the men caught could be considered absolutely treacherous.
Mertens gave Napoli the lead as well as a precious away goal during the first leg, only for Karim Benzema, Toni Kroos and Casemiro all to score and give Real the advantage heading into the second fixture.