The Nafplion Prickly Pear heart.

When Mary and Thanos first met they were high school students. There were many first times while they were together. Like eating crisps with a fanta and secretly smoking cheap Old Navy fags by the beach, then stealing oranges from house gardens and sticking their fingers in them to make the smell go away.

On their first bus trip  to Nafplion, they realised almost all prickly pear cacti had hearts on them. They decided to leave their trace too and many years later, their heart is still there and will eternally be.

Now, does it matter if they are still together?

Those were afterall, the sweetest years of life.