I love first time gay or bi stories. Reading detailed descriptions (both physical and emotional) of a man touching, tasting, taking another man for the first time is such a turn on. MM, MMF, MFM (but not as much as MMF), and MF, too. I also love tales of watersports, anything really naughty, and the "I" word we don't say on Lush, as Rube pointed out, lol.
"Imagination will often carry us to worlds that never were, but without it we go nowhere.”
― Carl Sagan
Historical and Supernatural
Kissing your lips while straddling your lap.