I'm with HalvSame... bet a buck or two more on the flop and turn, and as played ~$15 on the river. A 15/5 raises QQ pre-flop, so all that beats you is a set or 98s and I can't believe he doesn't bet those hands somewhere post-flop. Unless you've been super-aggro at this table. I put him on AsTs or JsTs.