One Last Breath

"Hanahaki Disease-- an illness born from one-sided love, the victim coughs up flower petals. It may be removed by surgery, but the feelings go away with the petals. It can also be cured when the love in returned."

Calypso leaves Leo for another, leaving him in despair. Soon after, he falls in love with his best friend, Nico Di Angelo. One day when Leo was visiting his best friend he ran into him making out with his boyfriend. Leo started to cough and choke. The couple hadn't noticed Leo until he fell to the ground, and Will brought him to the infirmary. Will asked about Leo's love interest, considering his condition. Little did Will know was that it was his own boyfriend.