Sixth Sense - Symbiotics, #6

At first, all they can do is look at each other through the thick glass panels of a hospital isolation ward. Then they agree to take a journey together, exploring each sense, one by one.By agreement, they torture each other with one sense at a time. When they are released from hospital and finally get together, nothing can stop the combustive passion that burns them through the night. But a shadow from Poppy's past threatens her life, and if Jim can't break the ingrained habits of a lifetime, he will lose her.
And if Poppy doesn't reassess her life, Jim could leave it before they learn what they really have. Sigh, sound, scent, touch, taste-so what's the sixth? They won't find out until they get there.