Obsess

(THINK p369) + RH middle finger on back of P-D LH "S", circle forward like a ferris wheel

Affixes

+s — Obsess
+ed — Obsessed
+ing — Obsessing
+ion — Obsession
+ion, +al — Obsessional
+ion, +s — Obsessions
+ive — Obsessive
+ive, +ly — Obsessively
+ive, +ness — Obsessiveness